Miao Room

Miao Room is the largest known cave chamber by volume in the world. It is a part of the Gebihe cave system, which is located in Ziyun Getu He National Park in Ziyun county of the Chinese province of Guizhou. The chamber, discovered by a French expedition called Gebihe'89 in 1989, measures 852 metres (2, 795 ft) in length, 191 metres (627 ft) in width, has an area of 154,500 square metres (1, 663, 000 sq ft), and a volume of 10,780,000 cubic metres (381, 000, 000 cu ft). In 2013, members of a British led expedition measured the chamber using 3-D laser scanners.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).