Ha Long Bay in Vietnam

Ha 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 islets. The region is popular for scuba diving, rock climbing and hiking, particularly in mountainous Cat Ba National Park.

Total Area: 1,553 km²

Source: Wikipedia & image from google