Mulu Caves, Malaysia

 

The Mulu Caves lie deep in the jungles of Borneo, sprawling for miles below Sarawak’s Gunung Mulu National Park. The sea carved the deep gorges and complex cave networks of the caves limestone system. Designated a UNESCO World Heritage Site in 2000, the Mulu Caves are considered to include some of the planet’s largest known underground caverns and passages. Notable caves are Benarat Cavern, Clearwater Cave, Wind Cave, and Sarawak Chamber, considered the largest known natural cavern in the world.