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 islets. The region is popular for scuba diving, rock climbing and hiking, particularly in mountainous Cát Bà National Park.
Ninh Bình is a province in northern Vietnam's Red River Delta. In the province's northwest, the vast Cúc Phương National Park is known for its green valleys, karst mountains and conservation centers. It has hiking trails and caves, and is home to many rare species including langur monkeys and pangolins. In the northeast, its namesake capital city is a base for exploring nearby temples.