Dong Thien Cung, literally ‘Heavenly Palace Cave’, is part of the larger Dau Go Cave system on Dau Go Island in  Ha Long Bay (fig.), an area dotted with some 2,000 lime stone islands.

The spacious cave with a high ceiling reportedly covers an area of around 10,000 square meters and is located at an altitude of circa 25 meters above sea level. Illuminated with spots in various colours, many locals consider it the most attractive cave in the bay.