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Learn about Ha Long Bay’s geology, mythology, and key sights with essential facts, stunning photos, and everything that makes the bay world-famous. Ha Long Bay, bay on the northwest coast of the Gulf of Tonkin, near the city of Ha Long (Hong Gai), Quang Ninh province, northern Vietnam. Situated 102 miles (164 km) southeast of Hanoi, the 580-square-mile (1,500-square-km) area contains some 3,000 rocky and earthen islands, typically in the form of jagged limestone pillars jutting out from the sea, and several caves and grottoes, all of which blend together to produce an exotic and picturesque seascape. A diverse population of marine and ... 1. What? Known as “Hạ Long” in Vietnamese, Halong Bay is a renowned UNESCO World Heritage site that features thousands of stunning limestone karsts and approximately 2,000 islands and islets. In recent years, Halong Bay has seen a significant increase in tourism, welcoming around 5 million visitors in 2023, with approximately 3.5 million being international tourists. 2. Where? Halong Bay is situated in the northeastern region of Vietnam, within Quang Ninh province, surrounded by ... Explore the best things to do in Ha Long Bay & activities: kayaking, caves, beaches, cruises & more. Ideal for 1-day or overnight itineraries.