In Avalon's tree-world, a knothole becomes a valley, and the outside of the trunk becomes similar to a cliff, or to Amara, though Avalon's surface is less steep than Amara's.
In Avalon's world of trees, a hole in the trunk creates a valley, while the exterior of the tree trunk resembles a cliff, similar to Amara, but Avalon's surface is gentler than Amara's.