Largest single cave chamber (surface area)

Based on surface area, the world's largest cave chamber is the Sarawak Chamber, Lubang Nasib Bagus, in the Gunung Mulu National Park, Sarawak, discovered by the 1980 British-Malaysian Mulu Expedition. Its length is approximately 700 metres (2,300 feet), its average width is 300 metres (980 feet) and it is at least 70 metres (230 feet) high and its surface area has been calculated to be 154,530 square metres (1.66 million square feet) as of 2015. The chamber is large enough to accommodate eight 747 jumbo jets in a row.

Sarawak is one of two Malaysian states on the island of Borneo.

While it is the largest cave chamber by surface area, it is not the largest by volume. The Miao Room – part of the Gebihe cave system in Ziyun Getu He National Park in Guizhou Province, China – was mapped with 3D laser scanners in 2013 and calculated to have a volume of 10.78 million cubic metres (380.7 million cubic feet) – about 10% greater than the volume of the Sarawak Chamber.