The Mulu Caves are located in the Gunung Mulu National Park in Malaysian Borneo. The park encompasses incredible caves and karst formations in a mountainous Borneo rainforest setting. The Sarawak chamber found in one of the underground caves is the largest cave chamber in the world. The national park is named after Mount Mulu, the second highest mountain in Sarawak, Borneo.

Mulu National Park is very difficult to reach and the only practical way of getting to and from it is by air. It is also possible to travel to the Mulu Caves Borneo by riverboat, but the whole trip by river takes around 12 hours from Miri. Accommodation is available at the Gunung Mulu National Park headquarters while cheaper lodging is available across the river.