A fairly simple surface, but I thought it was interesting how sand smoothed out most of the ground with just bits of rough dirt scattered around.
You can find the substance on Gumroad here: https://dctech.gumroad.com
Or on ArtStation: https://www.artstation.com/undertow/store
A variation in Marmoset
The SBSAR in Unreal
Color, height, normal, roughness and AO