This is a paid asset, but now you can download Vast Desert Environment for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Vast Desert Environment v1.0
Very large desert map, mostly formed by sand dunes, but it also has some smaller rocky areas with cliffs and dry vegetation.
The package contains 14 prefabs (rocks, cliffs and bushes) with the topology varying roughly from 400 to 2000 vertices and textures up to 4k.
Each prefab has an LOD component, which drastically improves the performance by not rendering objects that are far away from the player. This makes it possible for this map to be as big as it is without having much impact on your frame rate.
Don’t hesitate to contact me if you have any questions or problems with this package, I’ll do everything I can to ensure this asset meet your expectatios!
Texture dimensions: Up to 4k
Polygon count: On average 400 to 2000
UV mapping: Yes
Types of texture maps: Diffuse and Normal