Ha Long Bay is one of the world’s natural wonders and is the most beautiful tourist destination of Vietnam. Ha Long Bay, situated in the Gulf of Tonkin, includes some 1600 islands and islets forming a spectacular seascape of limestone pillars. Because of their precipitous nature, most of the islands are uninhabited and relatively unaffected by human influence. A distinctive feature of Ha Long Bay is the abundance of lakes within the larger limestone islands. For example, Dau Be island has six enclosed lakes.