I had some ideas:
- Smaller earthmotes floating above the mass
- A bowl-shaped earthmote above the mass with a portal to the plane of water, which pours down onto the land, and merges with the river
- Portals to the plane of fire, producing lava pools and fire plumes
- A forest of unusual color like purple

Background: This new fantastic terrain appeared recently in the Forgotten Realms due to something called the Spellplague. Basically two planes bumped into each other, and parts transposed between them. An earthmote is an example. The uncontrolled "wild magic" is gone but it left this extraordinary, exotic terrain features. Earthmotes can be forestmotes, fungusmotes, prairiemotes, watermotes, cavemotes, etc.