This page is “modular” or “inheriting” so first you must read arma terrain grid and cell sizes page to know the background and other sizes than listed below.

What size is your terrain? How to describe it on forums / chats? What size are official bis terrains?

New capability in ArmA 3 is that it / terran builder now supports 8192 grid.

We list square kilometer (km2) here just for reference, please do not use this measurement on forums etc when describing your terrain dimensions because the km x km is the standard we have used since 2001 OFP era. You can use all of these to explain your terrain size, but “km x km” or just “km” like “40km terrain” has to be the main focus to keep it simple.

Some terms for below table:
Satellite Tile is NOT satellite “texture”, it is the TILE to which satellite texture is chopped. These tiles can be found in Layers\ dir as *.paa files.
Texture Layer is internal WRP tech which is complicated to explain and basically is useless info in this pages context but we added it to be thorough.

Official bis terrain specifications