Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Military Desert Outpost Free.
Middle-East Environment v1.3
This package allows you to create traditional landscapes of the Middle East – deserted villages, oases, valleys and mountains, abandoned military bases.
– 90 prefabs (224 – including LoD stages) – village elements, military base elements, trees, rocks etc.
– One big demo stage (three different atmospheric)
– 7 ready-to-use terrains
– particles, ground and grass textures
Almost all textures are at 2048×2048 resolution. The materials have normalmaps, in some cases, paralax shading.