Hạ Long Bay, in northeast Vietnam, is known for its emerald waters and thousands of towering limestone islands topped by rainforests. Junk boat tours and sea kayak expeditions take visitors past islands named for their shapes, including Stone Dog and Teapot islands. The region draws scuba divers, rock climbers and hikers, the latter favoring mountainous Cát Bà National Park.
Halong Bay, situated in the Gulf of Tonkin, includes thousands of limestone islands which form a spectacular seascape of limestone pillars. Because of their precipitous nature, most of the islands are uninhabited and relatively unaffected by human influence.
Halong Bay is twice recognized as a UNESCO World Heritage Site. Following is my collection of contrasty, colorful and wild seascapes of Halong Bay and Bai Tu Long Bay.
More info: 500px.com (h/t: boredpanda)