Mountains' Graveyard

is a mountainous region located at the north-most region of the land between Takigakure and Otogakure. It has dense forestry and the bones of many giant creatures can be seen jutting out of it. It is the secret hideout of Meikai Uchiha.

Overview
Some time after his defection, Meikai set up a base here. There are passages that seemingly leads to different countries as Meikai was able to travel from the base to either the Land of Grass, Land of Lightning, or the Land of Earth.