|Location||Land of Ooo|
The Mystery Mountains is a region in the Land of Ooo. The mountains can be seen in the distance from where the Tree Fort is located. The Mystery Mountains were first named in "Evicted!" but were never explored until the episode "Gotcha!" At the highest point of the mountain, there is a cave that is on a small island surrounded by the Loch of Phantoms. The cave leads deep inside the mountain.