The Lost Mountain is an enclave realm of Jungle. It includes gravity. It is a horocyclic land with infinite height. Small bushes, big bushes, and platforms can be used to climb the mountain. Small bushes will break if stepping off to a tile that has no support underneath. Ivy can be used as platforms in this realm, but they hold no treasures when killed.
Using an Orb of Safety here will warp you back to the Jungle.