Is located in the north of Daugo Island, which is visible from the Tourist Wharf and about 4km. away. It is 25m above sea level, covering 3,000sq. meters and is divided into 3 chambers.
This is one of the largest and most beautiful grotoes in Halong Bay. Its structure is complex with different levels and chambers, which contain richly ornamented stalactites and stalagmites formed millions of years ago. Visiting Thiencung Grotto, tourists can enjoy interesting stories about the shapes of the stalactites and stalagmites closely connected to the Halong Bay legend of King Dragon. Photography is permitted.