Ha Long Bay a UNESCO World Heritage Site, and a popular travel destination, located in Quang Ninh province, Vietnam. Administratively, the bay belongs to H? Long City, C?m Ph? town, and part of Van Don district. The bay features thousands of limestone karsts and isles in various sizes and shapes. Ha Long Bay is a UNESCO World Heritage Site, and a popular travel destination, located in Qu?ng Ninh province.Several of the islands are hollow, with enormous caves. Wooden stakes cave is the largest grotto in the H? Long area. Its three large chambers contain large numerous stalactites and stalagmites as well as 19th century French graffiti. There are two bigger islands, Tu?n Châu and Cat Ba.