Sarawak,Mulu National Park.

A a view of krast

Gunung Mulu National Park is famous for its limestone karst formations. Features include enormous caves, vast cave networks, rock pinnacles, cliffs and gorges. Gunung Mulu is a sandstone mountain rising to 2377m.

Gunung Mulu National Park has the largest known natural chamber or room - Sarawak Chamber, found in Gua Nasib Bagus. It is 2,300 feet (700 m) long, 1,300 feet (396 m) wide and at least 230 feet (70 m) high. It has been said that the chamber is so big that it could accommodate about 40 Boeing 747s, without overlapping their wings. The nearby Deer Cave was, for many years, considered the largest single cave passage in the world

What is Krast?

Karst topography is a geological formation shaped by the dissolution of a layer or layers of soluble bedrock, usually carbonate rock such as limestone or dolomite,^[1] but has also been documented for weathering resistant rocks, such as quartzite, given the right conditions.^[2]

Due to subterranean drainage, there may be very limited surface water, even in the absence of any rivers and lakes. Many karst regions display distinctive surface features, with cenotes,sinkholes or dolines being the most common. However, distinctive karst surface features may be completely absent where the soluble rock is mantled, such as by glacial debris, or confined by one or more superimposed non-soluble rock strata. Some karst regions include thousands of caves, although evidence of caves large enough for human exploration is not a required characteristic of karst.