For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download Rocky Hills Terrain Pack for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Rocky Hills Terrain Pack
“If possible, please buy the package to support the developer”
Rocky Hills Terrain Pack is a package of 10 terrain meshes for use in your Unity projects. Low poly (2000 triangles) versions also included.
NEW v1.5: Better support for Unity Terrains with custom splat maps and textures. Make a better looking FPS!
Features:
– 10 ground meshes 100mx100m in size.
– 10 16bit splatmaps to apply to your Unity Terrains for accurate texture distribution.
– 2048×2048 diffuse and normal maps; a set for each mesh.
– 16bit greyscale RAW maps for Unity Terrains
– Daylight skybox. Each side is 2048×2048.
– Looks great on mobile!
Note: Clouds shown in some screenshots are from 3D Cloud Models package.