Thien Cung Cave is a famous beautiful cave in Ha Long Bay , located in the Dau Go island range in the southwest of Ha Long Bay, about 4 km from the cruise ship port.

Ha Long Bay is a bay on the west coast of the Gulf of Tonkin in the Northeastern Sea of ​​Vietnam , including the sea and islands of Ha Long city in Quang Ninh province .

In 1994, the core area of ​​Ha Long Bay was recognized by UNESCO as a World Natural Heritage with aesthetic value, and was re-recognized for the second time with outstanding global value in terms of geography and geomorphology in 2000.  Together with Nha Trang bay and Lang Co bayHa Long Bay is one of the 29 bays ranked and officially recognized by the World's Most Beautiful Bays Club in July 2003.