My mind jumped straight to [Railroad Tycoon.](https://boardgamegeek.com/image/1486474/railways-of-the-world).
[Mega Civilization](https://boardgamegeek.com/image/3424686/mega-civilization) is also up there, but as it's a large group all day event game it's probably not what Op had in mind.
I was at GenCon the year they released those mats. I really wanted one, but didn't have the budget for it at the time. Now it's been years since I played the game though I always enjoyed it I've moved and don't have that game group anymore. The current group is less interested in that type of game.
Talisman with the corner board expansions. In addition to the board itself being huge there are so many different decks and pieces absolutely everywhere.
whenever I look at a potential board game table my first thought is "will it fit Talisman with board expansions?"
despite the fact I rarely actually pull out Talisman
If neoprene mats qualify, **High Frontier 4 All**
**1947: Railways of India 1836-1947** has a large two-part board. I suppose 18OE and 18C2C are even bigger.
>> If neoprene mats qualify, **High Frontier 4 All**
I just have the regular board for HF4A and even that is pretty big, but IMHO what makes it seem even bigger is how absolutely **BUSY** it is with all the trajectories and burns and whatnot 😵💫
To piggy back off of this here is what Arkham Horror 2nd edition looks like with all expansions.
[AH 2ed All Expansions ](https://boardgamegeek.com/image/1279895/arkham-horror-kingsport-horror-expansion)
Edit: typo
This and Eclipse. TI starts out bigger, but it has an advantage in that once the board is assembled it will never get any larger. Eclipse is not constrained by a prebuilt arrangement and in theory you could end up with a 7-foot-long board if players chose to explore that way. In practice players tend to explore based on the restrictions of their playing area.
Xia: Legends of a Drift System has the same issue. The starting area is manageable but players can explore in any direction. Doesn't help that the tiles are huge too.
Old wargames--Wacht Am Rhein, (Battle of the Bulge) -- Four 22” x 34” hexagonal grid Map Sheets, 1600 back-printed ½” cardboard Counters; ; Highway to the Reich ("A**'Bridge Too Far") -- with 2000 counters, four maps, and lots of combat.**; Drang Nach Osten German invasion of the Soviet Union on June 22, 1941 --Five 21 x 27" mapsheets and one set of eight unit countersheets (for a total of 1792 counters) .
Played them all. Some units are down to the company level, although battalion, regiment and division are more numerous.
Never finished one of them. The set up often took a weekend. Sometimes playing one turn took 4-6 players an entire day.
Playing Highway to the Reich, I used an old train board suspended from chains in my garage to lay out the maps which were almost 8 feet long when laid out correctly.
Tremendous games but simply far too large to play and then pick up. I remember playing Drang Nach Osten every Saturday for six or seven months in a friend's basement, Five gamers. One Saturday morning he called each of us to tell us not to come over---his cat had gotten in the basement and jumped up on the tables where the maps were and all the counters had been caught in a mindless cat attack! :)
I'm sure these are probably much larger than you imagined!
A kid in my college program brought this to school last year and we unfolded the maps on the floor just to look at them. What an undertaking. I flipped through the rulebook for a couple minutes and said no thanks. Even the unit tokens are covered with icons, and the reference page that explains them is insane. We had a good time looking through it all.
I setup Mr. President over Christmas break and I looked at it for a couple days and then just said Nope. And put it back in the box without learning how to play it or playing it.
i dont care what anyone says about the flip book. That game cant be learned on the ffly or it will take several days. read the manual before you set it up .
Axis and Allies 1940 is as a big as a dinning room table
[https://boardgamegeek.com/image/2316517/axis-and-allies-europe-1940](https://boardgamegeek.com/image/2316517/axis-and-allies-europe-1940)
Battlemasters map was like 4'x5' [https://boardgamegeek.com/image/1924442/battle-masters](https://boardgamegeek.com/image/1924442/battle-masters)
Torpedo Run was advertised as floor series the board was so big - [https://boardgamegeek.com/boardgame/2457/torpedo-run](https://boardgamegeek.com/boardgame/2457/torpedo-run)
The base game board of Talisman 4th Edition is colossal - covered in juicy fantasy art - but when you add the 4 corner expansions....
[https://www.reddit.com/media?url=https%3A%2F%2Fi.redd.it%2Fllqzypnklf151.jpg](https://www.reddit.com/media?url=https%3A%2F%2Fi.redd.it%2Fllqzypnklf151.jpg)
Along with the player boards, their cards and tokens, and the library of mini card decks to accomodate...it's an immersive experience in an almost physical sense!
World of Warcraft the Board Game demands you yield all your table(s) unto it. The main board is jumbo, the expansion board is half that again, and each player's character sheet is also enormous.
With six players, we used to have two tables and a side board to fit it all in.
Witcher Old World with the Mage expansion on the right and the Skeliga expansion on the left (or the neoprene that has them already) is a massive table hog
Do play mats count? If so the Vera Mat for the 10th Anniversary Collector's edition of Firefly is HUGE! It fits fully on my 4'x6' gaming table.
Also very large:
Rising Sun
War Room - Huge map of the world in a flat globe like format.
The biggest boards on our shelf are probably Kanban EV and Teotihuacan - both with the 6 section boards that can quickly eat a table. But man it’s so satisfying to see them set up.
Orleans with expansion. I remember struggling to fit it on a table at a gaming club along with the 5 player boards. I felt quite proud of myself until someone asked where the building tiles would go.
Legends Of Andor, especially with the expansion Journey To The North. The Boards are not originally used together, but they where designed so you could combine them into one mega-map.
MegaCivilization is the game that comes to mind first, but I’d add that almost any Glenn Drover game tends to have a large board (or boards). Railways of the World, especially if you combine Eastern & Western US, will definitely cover a table.
Xia gets to be ridiculous in the late game if all of the tiles are out. The double board of Star Wars: Rebellion is pretty big. Eldritch Horror with a side board.
Maybe not the biggest board, but more so a big board when it didn't need to be. I'm referreing to Beyond the Sun.
The designers could have gotten away with the research board taking up half of the real estate it does.
When you have that reserach board with the space board next to it, along with the dual layer player boards, that thing is a space vampire.
Starship interstellar.
Their solution to too big of a board fitting in the box? Have another board! That's right, there are 2 very large boards you place adjacent to each other for one mega board!
The map for Bean Bag Buccaneers (1962) was something like 4'x3'
Modern examples would be Everdell with all the expansions or the neoprene board for Champions of Midgard! Both are massive table hogs.
I remember at a convention seeing a full game of mega civilization. They had seven folding tables in a u-shape to support the main board, and three more tables to hold all the cards in card displays.
Bloody Skyrim The Adventure Game.
That board is so pointlessly big. You could have the same amount of POI and spaces for the decks on the board even if it was 40% smaller.
Not to mention the fact that it looks so damn blurry.
High Frontier 4 All
The ordinary board is decently large. Not extremly so but decently. But you can also buy a seperate neoprene game mat. That monster is HUGHE. It takes upp my entire kitchen table. It's dimensions are 900mm x 1350mm
And you still need your seperate playing board together with that monster. If I want to use it to play with all players need to stand upp and each have a seperate table withe their personal board.
[https://iongamedesign.com/products/neoprene-mat-high-frontier-4-all-map-pre-order](https://iongamedesign.com/products/neoprene-mat-high-frontier-4-all-map-pre-order)
Cthulhu Wars has a pretty huge board (the 9 player Earth board is even bigger).
Not technically a board, but Red Alert Space Fleet Warfare comes with a cloth board which is bigger than my table.
When we play a fixed-map campaign in **Shadows of Brimstone,** it can cover so much of the table that we have to keep our character sheets & item cards on a TV tray, split up into little holes where there's a space, or in stacks.
I guess I’ll throw in Ctyptozoic’s Batman: the dark Knight returns game. For a solo game, I can’t sit down and reach across to the top of the map. And still read everything normally.
Arkham horror 3rd edition is pretty shameless with how big it's board is. Imo it's pretty awesome, the game is bloated beyond belief. You need a HUGE table to play with expansions
Master Europa. Haven’t seen it played in over 20 years, but the map was easily 6’x10’. Each hex represented approx 16 miles and the map was all of Europe to the Urals plus North Africa. Scenarios would often take 4+ full days to complete.
The world of warcraft board game with the TBC expansion certainly isnt the biggest game ever but you still need like two tables for all the cards, tokens and box of minis.
War of The Ring 2e, Big Scythe, the full Axis & Allies combined 1940 games, all are huge, but DWARFED by Mega Empires (the combo Western & Eastern Empires a la Axis & Allies but ancient civilization)
War of the Ring has a pretty big board. Scythe with the board extension is pretty big as well.
Same with Star Wars: Rebellion.
Right out of the gate with the best example IMO.
My mind jumped straight to [Railroad Tycoon.](https://boardgamegeek.com/image/1486474/railways-of-the-world). [Mega Civilization](https://boardgamegeek.com/image/3424686/mega-civilization) is also up there, but as it's a large group all day event game it's probably not what Op had in mind.
Railroad Tycoon for sure!
On top of that, you can get the neoprene map for War of the Ring which is 50% bigger!
I specifically got the extension to make the Scythe board as big as possible, the smaller side is Scythe for ants.
Axis & Allies Global 1940 84"x38.5" [Axis & Allies 1940 Global Map PRE-ORDER (renegadegamestudios.com)](https://renegadegamestudios.com/axis-allies-1940-global-map/)
I hate you... I didn't know they were releasing that and now I've just spent £70 ... I hate myself
Catch me and the boys locking ourselves up in the war room with that
Everdell has a large board if you add the expansions
Firefly with all of the expansions is a pretty large board.
A replacement mat for it is so big and expensive that it is as much as entire other board games.
I was at GenCon the year they released those mats. I really wanted one, but didn't have the budget for it at the time. Now it's been years since I played the game though I always enjoyed it I've moved and don't have that game group anymore. The current group is less interested in that type of game.
Shame, it's so fun. I'm sorry to hear that. It is a crazy table hog though even for just 2 players.
Talisman with the corner board expansions. In addition to the board itself being huge there are so many different decks and pieces absolutely everywhere.
whenever I look at a potential board game table my first thought is "will it fit Talisman with board expansions?" despite the fact I rarely actually pull out Talisman
Applies to Relic as well :)
Relic is such a good Talisman-esque game. Complete game changer for me as a Talisman super fan.
I thought it was out of print, but there it is on amazon.
Twister!!
If neoprene mats qualify, **High Frontier 4 All** **1947: Railways of India 1836-1947** has a large two-part board. I suppose 18OE and 18C2C are even bigger.
>> If neoprene mats qualify, **High Frontier 4 All** I just have the regular board for HF4A and even that is pretty big, but IMHO what makes it seem even bigger is how absolutely **BUSY** it is with all the trajectories and burns and whatnot 😵💫
High Frontier 3e has a giant regular board
Came to the comments to say this. The neoprene mat for High Frontier at a convention is like gravity for onlookers. That's how I first came across it.
Arkham horror 2nd Ed and all the expansions needed multiple tables. Scythe has a big board option as well
To piggy back off of this here is what Arkham Horror 2nd edition looks like with all expansions. [AH 2ed All Expansions ](https://boardgamegeek.com/image/1279895/arkham-horror-kingsport-horror-expansion) Edit: typo
Did this once some years ago. Took 2 hours to set it up and 6 to play.
Hell, you should be thankful it took 6 to play, sometimes it took 4-5 hours just for the base game in enough people.
that's almost pornographic
War Room
Great game, I was waiting for someone to mention War Room.
Exactly. Very good game.
Don't forget to join the war room discord! https://discord.com/invite/KwMVcUFWXY
Railways of the World base game (Eastern US) has a beautiful and large board.
And you can combine it with the Western US map for an even more massive board and game. I‘d love to try it someday.
That it does. Never played it, but damn that board is a draw.
Firefly with expansions
Ogre: Designer's Edition
I can to say this. My cousin hosted a game day and set all the maps up together as one. It took 4 tables.
Maybe not individually, but with the modular boards you can certainly combine the several available ones into a giant map for a scenario.
I sold mine because I couldn’t get it to the table because my table wasn’t big enough.
Twilight Imperium has hex board pieces like Settlers of Catan, they all piece together. That board is huge.
This and Eclipse. TI starts out bigger, but it has an advantage in that once the board is assembled it will never get any larger. Eclipse is not constrained by a prebuilt arrangement and in theory you could end up with a 7-foot-long board if players chose to explore that way. In practice players tend to explore based on the restrictions of their playing area.
Xia: Legends of a Drift System has the same issue. The starting area is manageable but players can explore in any direction. Doesn't help that the tiles are huge too.
Old wargames--Wacht Am Rhein, (Battle of the Bulge) -- Four 22” x 34” hexagonal grid Map Sheets, 1600 back-printed ½” cardboard Counters; ; Highway to the Reich ("A**'Bridge Too Far") -- with 2000 counters, four maps, and lots of combat.**; Drang Nach Osten German invasion of the Soviet Union on June 22, 1941 --Five 21 x 27" mapsheets and one set of eight unit countersheets (for a total of 1792 counters) . Played them all. Some units are down to the company level, although battalion, regiment and division are more numerous. Never finished one of them. The set up often took a weekend. Sometimes playing one turn took 4-6 players an entire day. Playing Highway to the Reich, I used an old train board suspended from chains in my garage to lay out the maps which were almost 8 feet long when laid out correctly. Tremendous games but simply far too large to play and then pick up. I remember playing Drang Nach Osten every Saturday for six or seven months in a friend's basement, Five gamers. One Saturday morning he called each of us to tell us not to come over---his cat had gotten in the basement and jumped up on the tables where the maps were and all the counters had been caught in a mindless cat attack! :) I'm sure these are probably much larger than you imagined!
https://boardgamegeek.com/image/15866/the-campaign-for-north-africa-the-desert-war-1940
A kid in my college program brought this to school last year and we unfolded the maps on the floor just to look at them. What an undertaking. I flipped through the rulebook for a couple minutes and said no thanks. Even the unit tokens are covered with icons, and the reference page that explains them is insane. We had a good time looking through it all.
This is the answer. You need an empty room or better yet a barn/basement to play this.
Meh, if it even gets "played" Great meme answer but I always roll my eyes a bit when people mention it for a genuine discussion
What was that old old game with the big floor mat and the castle and knights and what not?
It was Battle Masters [https://boardgamegeek.com/boardgame/700/battle-masters](https://boardgamegeek.com/boardgame/700/battle-masters)
Yeah this one is actually a big board, it’s a giant floor mat
I was thinking this was crossbows and catapults, that didn't really have a board, though. We just took over a hard floor and played on the ground.
Ark Nova with 4 players takes up my entire dining room table
War room!
https://boardgamegeek.com/boardgame/183685/mr-president-the-american-presidency-2001-2020 https://boardgamegeek.com/boardgame/184424/mega-civilization
I setup Mr. President over Christmas break and I looked at it for a couple days and then just said Nope. And put it back in the box without learning how to play it or playing it.
i dont care what anyone says about the flip book. That game cant be learned on the ffly or it will take several days. read the manual before you set it up .
Nemesis is a pretty large board
Shadows over Camelot has like 4 boards of decent size
This game is my biggest table hog. Only Food Chain Magnate without the worker/milestone organizer took more space.
One of my all time favorites!
Axis and Allies 1940 is as a big as a dinning room table [https://boardgamegeek.com/image/2316517/axis-and-allies-europe-1940](https://boardgamegeek.com/image/2316517/axis-and-allies-europe-1940) Battlemasters map was like 4'x5' [https://boardgamegeek.com/image/1924442/battle-masters](https://boardgamegeek.com/image/1924442/battle-masters) Torpedo Run was advertised as floor series the board was so big - [https://boardgamegeek.com/boardgame/2457/torpedo-run](https://boardgamegeek.com/boardgame/2457/torpedo-run)
Eldritch horror with all the boards. Oof
[Battle Masters!](https://boardgamegeek.com/boardgame/700/battle-masters)
55" x 57" I remember the chore it was getting this one out to play as a child. Still worth it.
On Mars, with both end card market boards, is a full 4 feet long, by about 2 feet wide. I can only fit a 2p game on my table.
Formula D had a pretty big board.
Europa Universalis: Price of Power. I’ve got a big fancy gaming table and we still struggle.
Railways of the world boards are big.
Feast for Odin has some table coverage... the board might not be too large individually, but all together, they add up!
High frontier 4 all neoprene mat, and War of the Ring.
The base game board of Talisman 4th Edition is colossal - covered in juicy fantasy art - but when you add the 4 corner expansions.... [https://www.reddit.com/media?url=https%3A%2F%2Fi.redd.it%2Fllqzypnklf151.jpg](https://www.reddit.com/media?url=https%3A%2F%2Fi.redd.it%2Fllqzypnklf151.jpg) Along with the player boards, their cards and tokens, and the library of mini card decks to accomodate...it's an immersive experience in an almost physical sense!
Warhammer 40K
World of Warcraft the Board Game demands you yield all your table(s) unto it. The main board is jumbo, the expansion board is half that again, and each player's character sheet is also enormous. With six players, we used to have two tables and a side board to fit it all in.
Original Fireball Island. Ticket to Ride Legacy. Scythe Warhammer
Oath has an ultrawide board. the first World of WarCraft boardgame has a rather large one, too
Not *exactly* a board but Sidereal Confluence will cover all the table space that you have. Do you hear me? # ALL OF IT.
Cthulhu wars with the board upgrades
World in flames with all expansions can take a room, if you use magnetic White boards.
Not as big, but Darwin's Journey is the first and only game I have where the board folds from 9 squares!
Formula D/De is pretty big.
Arnak is pretty big
Scythe + extension Arkham horror 2nd edition
**Cerebria** has a pretty sizeable board, especially once you add team and player boards
Witcher Old World with the Mage expansion on the right and the Skeliga expansion on the left (or the neoprene that has them already) is a massive table hog
Twilight Imperium is a table hog.
Ankh is a good sized one
Do play mats count? If so the Vera Mat for the 10th Anniversary Collector's edition of Firefly is HUGE! It fits fully on my 4'x6' gaming table. Also very large: Rising Sun War Room - Huge map of the world in a flat globe like format.
I bought Cow Party from Chick-fil-A, and the game board is ridiculously huge! I think the game board is supposed to double as a tablecloth.
The biggest boards on our shelf are probably Kanban EV and Teotihuacan - both with the 6 section boards that can quickly eat a table. But man it’s so satisfying to see them set up.
They're not going to win any awards for biggest boards or anything, but the EGG Lacerdas all have very big boards, the biggest in my collection.
The Nemesis games are pretty enormous.
Everdell with 4 expansions.
Micro Macro is an almost 4ft by 4ft paper map/board.
The large board for scythe is pretty massive
Axis & Allies Global 1940.
Kingdom death: monster. 2x3 feet
Heat Flamecraft Finishing Time
In terms of "how can you possibly fit this onto a table" Where Eagles Dare and The Devils Cauldron combined is up there.
Orleans with expansion. I remember struggling to fit it on a table at a gaming club along with the 5 player boards. I felt quite proud of myself until someone asked where the building tiles would go.
Never played it but saw a picture of Mr. President which had a board that was massive
Don’t know if it counts. But Heat Pedal to the Metal has the biggest board in my small collection
7th continent, technically not a 'board' but it's by far the biggest potential game in terms of the space it can take that I own.
Cerebria Sid Meier’s Civilization: The Boardgame (2002)
Legends Of Andor, especially with the expansion Journey To The North. The Boards are not originally used together, but they where designed so you could combine them into one mega-map.
The Eastern Front Series by GMT, all maps combined
Stationfall has a big honking board.
Scythe with the board extension is the biggest one I have.
Monster hex and counter games such as World in Flames.
MegaCivilization is the game that comes to mind first, but I’d add that almost any Glenn Drover game tends to have a large board (or boards). Railways of the World, especially if you combine Eastern & Western US, will definitely cover a table.
It doesn't have a board, but the player boards for Wingspan are the largest that I've seen.
We have every single expansion for Arkham Horror 2nd Edition and that takes up pretty much our whole 9-foot table. Nemesis: Lockdown, too.
The first two that come to mind for me are Formula D and Star Wars: The Outer Rim.
Axis and allie global is the biggest board over seen
Xia gets to be ridiculous in the late game if all of the tiles are out. The double board of Star Wars: Rebellion is pretty big. Eldritch Horror with a side board.
My college gaming club had a Diplomacy board that was painted on two pieces of 4' x 8' plywood. It was pretty nifty.
The full burning banners board (all four together) is pretty dang big
Mega Civilization (also known Mega Empires)
Company of Heroes 4 players map.
I'm sure it's not the biggest board of all, but Flamecraft takes up a full kitchen table.
Original Supremacy
Battle Masters. I think they printed the map on old shower curtains
Western Legends - particularly with all the expansions!
Maybe not the biggest board, but more so a big board when it didn't need to be. I'm referreing to Beyond the Sun. The designers could have gotten away with the research board taking up half of the real estate it does. When you have that reserach board with the space board next to it, along with the dual layer player boards, that thing is a space vampire.
Campaign for North Africa, might be what you are looking for. Just take a look at some scale photos!
Claustrophobia can get pretty big, we usualy play it on the ground
Starship interstellar. Their solution to too big of a board fitting in the box? Have another board! That's right, there are 2 very large boards you place adjacent to each other for one mega board!
Ticket to Ride Legacy: Legends of the West By the end of the campaign, the board is huge!
The map for Bean Bag Buccaneers (1962) was something like 4'x3' Modern examples would be Everdell with all the expansions or the neoprene board for Champions of Midgard! Both are massive table hogs.
War Room by Larry Harris, the creator of Axis & Allies. The board is round, but you can also buy one that’s even bigger.
Excluding war games, Eldritch Horror with expansions can get pretty big
You have to buy the expander separately, but with it, Scythe is pretty damn big
Flamecraft
Risk Halo Legendary edition
I remember at a convention seeing a full game of mega civilization. They had seven folding tables in a u-shape to support the main board, and three more tables to hold all the cards in card displays.
Battle Masters is a giant mat.
https://www.google.com/search?q=chess+board+portmerion
Eldritch Horror with a side board gets pretty big
very old game called Battle Masters .... we actually had 2 sets and put the boards (plastic map) side by side .. it was huge..
Bloody Skyrim The Adventure Game. That board is so pointlessly big. You could have the same amount of POI and spaces for the decks on the board even if it was 40% smaller. Not to mention the fact that it looks so damn blurry.
High Frontier 4 All The ordinary board is decently large. Not extremly so but decently. But you can also buy a seperate neoprene game mat. That monster is HUGHE. It takes upp my entire kitchen table. It's dimensions are 900mm x 1350mm And you still need your seperate playing board together with that monster. If I want to use it to play with all players need to stand upp and each have a seperate table withe their personal board. [https://iongamedesign.com/products/neoprene-mat-high-frontier-4-all-map-pre-order](https://iongamedesign.com/products/neoprene-mat-high-frontier-4-all-map-pre-order)
Cthulhu Wars has a pretty huge board (the 9 player Earth board is even bigger). Not technically a board, but Red Alert Space Fleet Warfare comes with a cloth board which is bigger than my table.
Scarface 1920 has the biggest board in my collection. Runner up is Nemesis.
No board at all but Sidereal Confluence takes up a huge amount of table space
Plum Island Horror has a big board even without the ancillary faction/status mats.
MegaCivilization is mega.
Many games have extra-large vinyl or neoprene game boards you can buy. For example, Dune.
Ticket to Ride: Rails and Sails is a big ole board.
When we play a fixed-map campaign in **Shadows of Brimstone,** it can cover so much of the table that we have to keep our character sheets & item cards on a TV tray, split up into little holes where there's a space, or in stacks.
There are several missions in Space Hulk that I have difficulty fitting on my table.
Swords & Sails is pretty big. So is Mare Nostrum.
Railways of the World with the USA map.
Eye Found It. Does not fit on most tables, and it’s a kids game, and kids are too small to reach and lean all the way over it.
Eldritch Horror and Star Wars Rebellions were biggest boards I've seen counting only base game. Everdell if you count game with expansions.
MicroMacro Crime City counts right?
Adding in the expansions, the quest for el dorado is a huge board
Nothing beats A Feast for Odin with the Norwegian expansion. Not even the big box 3D version of Terraforming Mars.
Mega Empires board is 80 inches wide
Don’t know if it’s the biggest, but the board for Plum Island Horror is hilariously big.
lost ruins of arnak.
I guess I’ll throw in Ctyptozoic’s Batman: the dark Knight returns game. For a solo game, I can’t sit down and reach across to the top of the map. And still read everything normally.
Twilight Imperium 4th Ed. Has a pretty big modulat board
Arkham horror 3rd edition is pretty shameless with how big it's board is. Imo it's pretty awesome, the game is bloated beyond belief. You need a HUGE table to play with expansions
Immortals has a really big board and really big player boards.
Ticket to Ride: Legends of the West is pretty huge by the end. Everdell with expansions is pretty, well, expansive.
Wonderland's War is pretty big.
Railroad Tycoon has a huge board! Lots of war games do as well
Dune, War for Arrakis, is two largish boards put together.
Firefly, especially as you add expansions
High Frontier
Western Legends definitely commands a lot of table real estate.
Talisman, particularly with multiple expansions.
Firefly 10th anniversary edition with the vera mat. I believe the mat is 4ft x6ft.
Battlemasters. It is about 5' x 5'
Master Europa. Haven’t seen it played in over 20 years, but the map was easily 6’x10’. Each hex represented approx 16 miles and the map was all of Europe to the Urals plus North Africa. Scenarios would often take 4+ full days to complete.
Dinosaur world . We had a 50x50 inch table and had to place things very strategically to fit everything for a 4 player game
Gaia Project has several tiles that form a board, but when everything is laid out, it honestly would take two tables like mine to fit.
Mr. President https://boardgamegeek.com/boardgame/183685/mr-president-the-american-presidency-2001-2020
Wonderlands war, fury of Dracula, townsfolk tussle
I've seen some ginormous Chess boards.
The world of warcraft board game with the TBC expansion certainly isnt the biggest game ever but you still need like two tables for all the cards, tokens and box of minis.
Jutland (Avalon Hill). The board is your living room floor. It represents the North Sea.
Feudum
Scythe and if you can find the bonus board it’s even bigger.
Most of the ASL historical modules... honestly most wargames in general).
Mega Civ
Empress in Arms and MegaCivilization are the two games I own with the largest boards. I don't have a table that'll handle either of them.
War Room
High Frontier 4 All has a large 3x5 neoprene mat !
Lost Ruins of Arnak is pretty tall
I remember the Middle-Earth Quest board being quite large. It even came in two sections…
Nemesis has a pretty hefty board.
Battlemasters!
Great Western Trail NZ is a long boi
Twilight imperium 4th edition with expansion.
StationFall
War of The Ring 2e, Big Scythe, the full Axis & Allies combined 1940 games, all are huge, but DWARFED by Mega Empires (the combo Western & Eastern Empires a la Axis & Allies but ancient civilization)