Largest single cave chamber (surface area)
Sarawak Chamber
Malaysia ()

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.