The Great Underground Mountain was built on the Southern Shore of the Lake Flathead, on a tiny plateau. Its peak was just few feet below the ceiling of the Flathead Castle. Around it were the Great Underground Savannah and beyond, the Great Underground Desert.

Dimwit Flathead "climbed"[1] the mountain frequently to enjoy the view.

An amulet was let there, taken by the First Dungeon Master.

A boulder blocked the entrance to a grotto which housed a key-shaped button and a Shrine of St. Foobus of Galepath.

  1. Carried up in a plush sedan chair. Those squibblers who said that were tortured to death