Located in a distance of three-hour drive east of Hanoi, Halong Bay is a breathtaking landscape of 1,969 densely clustered limestone islands, arches and pinnacles rising right out of the emerald waters. Listed as World Heritage Site by UNESCO since 1995 for its surreal beauty, Halong Bay is one of Vietnam's top destinations.
Hạ Long Bay has an area of around 1,553 km2, including 1,960–2,000 islets, most of which are limestone. The core of the bay has an area of 334 km2 with a high density of 775 islets. The limestone in this bay has gone through 500 million years of formation in different conditions and environments. The evolution of the karst in this bay has taken 20 million years under the impact of the tropical wet climate. The geo-diversity of the environment in the area has created biodiversity, including a tropical evergreen biosystem, oceanic and sea shore biosystem. Hạ Long Bay is home to 14 endemic floral species and 60 endemic faunal species.