Some of the terrains part of my "Volcanic Terrains Collection Vol.1" available here:

Website: https://andreacantelli.art/store/xAorj/volcanic-terrains-collection-vol-1-12-terrains-at-8k-resolution-heightmaps-textures-mesh
ArtStation: https://www.artstation.com/a/17359822
Gumroad: https://andreacantelli.gumroad.com/l/jhtbs