The Desert (サバク (sabaku)) is a type of terrain in Game Boy Wars 3.
The Desert is rough terrain, slowing down any land units having to cross it. Despite the roughness, it doesn't give much defense in compensation. In addition, it can't be affected by the Constructor. Though it is also immune to effect from the Strategic Bomber.
The Desert terrain isn't entirely common, but when it's around, there's usually a lot of it gathered around, though the clump doesn't entirely hamper the land units' ability to move past the sandy areas, since it's typically accompanied either by Wasteland (which can be removed without too much difficulty from the Constructor) or by Roads.