These caves are built into the side of one of Ninjago's largest mountains. It is made up of an incredibly complex system of tunnels. It is the location of an old mining camp, featuring old watchtowers, rail cars, tools and lighting fixtures built into the cave.
This cave is home to creatures such as Burning Snakes, Wicked Spiders, and Rockslide Bats.
A few varieties of plants grow in the caves, including Mushyrooms, Pop-Rock-Corn, and Lime Stones.
The caves contain various areas, such as a Mud Slide, the Lost Lost Tunnel, and the Maze of Doom.
The caves have also been known to been a headquarters to Elemental Masters of Earth.