earthberg

noun2

1. •
   A mass suspended or floating in water, similar to an iceberg, but consisting of earth (dirt, soil, etc.).

   • The landscape of the Elemental Chaos is broken up by rivers of lightning, seas of fire, floating earthbergs, ice mountains, and other fantastic terrain features. — 2008
2. •
   (rare) A mountain or large mound of earth.

   • Unsurprising, given that he'd spent most of his life in the Well, sheltered by the very earth-berg he now rose beside, hoisted on creaking cables. — 2008