You want BIG BIG BIG map to use in Beamng? Come on over!

[Los.Injurus.Bob.Blunderton]

You want a BIGGER map because BIGGER is better right???

Okay, I have three maps for all to try, plus I have added many others in the links below the 1st and 2nd maps, which deserve honorable mention due to quality, are just plain huge, or are really fun!

Roane County Tennessee https://www.beamng.com/resources/tennessee-usa-roane-county-beta-real-terrain-8gb-system-ram-reqd.1586/
144 square miles of open-world terrain, in a lush, forested environment. Welcome to rural Tennessee, where over 160 miles of road await, highways, rural winding roads, side-streets, dirt trails and all await you. Several towns dot this map in varying stages of completion. The road network is mostly completed, though. Requires 8gb or more of system RAM.
Includes an airport, and multiple spawn points. Decent GFX card recommended.

Coming in slightly smaller at 10.4km x 10.4km is Southern California (So-Cal) Interstate
https://www.beamng.com/resources/so-cal-interstate-highway-126-miles-of-road-path.891/
42.4 miles of expressway, 63+ miles of surface road & 15 miles of jeeping trail & then some
Plenty of limited-access highways, in a semi-arid/arid desert-style environment. No trees or buildings to slow you down - at all - not one. In the future it may have some buildings and a small forest but for now, it has nothing but a beautiful road network for you to cruise on, if that's all you want, then have at it, it will keep you busy for a while. About 120 miles of roadway here to enjoy.

A 6km x 6km desert map, Nevada Interstate, which was my first, which shows much polish but admittedly doesn't have the most amazing graphics in the world. It's still quite fun, and here it is, Nevada Interstate, new and improved and hopefully bug-free:
https://www.beamng.com/resources/nevada-interstate-prequel-to-so-cal-interstate.922/
Built off Ouerbacker's Black Hills 2015 with permission, since I loved that map so much.

All of my maps work with the AI and it should be fine. My maps will be updated in the future & maintained to stay current and working with the game version updates.

You can also look up DESERT HIGHWAY on the same website I linked above: https://www.beamng.com/resources/desert-highway-updated-version-13-1.50/
It's almost the same size as Roane County (just slightly smaller), but it's in a desert, and has great FPS. It's just recently had an update.

DoullPepper's altitude is a consistently high-ranking map that's fairly large and a challenging circut track to drive on, it's quite a fun one though and very well made. https://www.beamng.com/resources/altitude.251/
While not quite as large as the other's mentioned here, it's a very well made map and rather complete.

There's also the 'crash hard' map which is used in many youtube videos. It is great for setting up crashes if you're into that sort of thing, and also decently large. While it's not quite realistic, it does give you plenty of opportunities to crash about. It's worth a mention as I enjoyed it myself https://www.beamng.com/resources/crash-hard-map-final-version-maybe.325/

Lastly, Garfield Heights (no relation to the fat orange cat) is a very well detailed map, though not yet completed, and somewhat small in it's current iteration, is chock-full of custom models, and plenty of crash opportunities. Simulates the American suburbs rather well, if you're looking to role-play or just wreck about on a new map, here you go:
https://www.beamng.com/resources/garfield-heights.1557/
This map contains many of the house models I used with permission in Roane County.

A completely lifeless, barren, large salt flat, for extreme space to get up to speed:
https://www.beamng.com/resources/the-flats.2107/

An endless highway for cruising at extreme speeds, it's nothing more than the ocean and a seemingly infinite route that crosses it, however, for making a good crash, it'll definitely do the job! https://www.beamng.com/resources/endless-highway.1427/

Advanced island, an old map remade by someone I know, which I had a hand helping with, hope you enjoy it! https://www.beamng.com/resources/advanced-island-redux.1399/

Car jump arena! Enjoy doing what Beamng.drive was made to do, wreck, wreck, fall, and wreck some more. Includes translucent globe-statue that you can manually stick the car inside of and drive around in loops with until you're sick.
https://www.beamng.com/resources/car-jump-arena.1362/

A runway, a desert, and a good environment for flying about in, if you wish to just fly
https://www.beamng.com/resources/desert-runway.1961/
Not very many roads in this map, but for you ace pilots out there, this one's for you.
If you have any other worthy suggestions, feel free to add.

[virxtra]

damn thanks

[aethos]

my hero

[Floof]

you can also add this map to the list as well.
https://www.beamng.com/resources/american-road.3100/
its not just big, but it also comes with some decently modeled bioms too.