Ha Long Bay is a small bay in the western part of the Gulf of Tonkin in the Northeast Sea of Vietnam, including the island waters of Ha Long City, Cam Pha City and part of Van Don Island District of Quang Ninh Province. Being the center of a large area with similarities in geology, geomorphology, landscape, climate and culture, with Bai Tu Long Bay in the northeast and Cat Ba archipelago in the southwest, Ha Long Bay is limited to an area of about 1,553 km² including 1,969 islands, large and small, most of which are limestone islands, of which the core area of the Bay has an area of 335 km², dense 775 islands. The limestone tectonic history of the bay has been around for 500 million years with very different geographical and ancient circumstances; and the full karate evolution over 20 million years with a combination of factors such as thick limestone layers, hot and humid climate and a slow process of tectonics in general. The combination of environment, climate, geology and geomorphology has made Ha Long Bay become a cluster of biodiversity including tropical moist tropical evergreen rainforest ecosystem and coastal and marine ecosystems. shore with many sub-ecosystems. 17 species of endemic plants [and about 60 species of endemic animals have been discovered among the thousands of flora and fauna colonized in the Bay.The world-recognized heritage area on Ha Long Bay (core area) is 434 km², as a triangle with three peaks, Dau Go Island (west), Ba Ham Lake (south) and Cong Tay Island. (in the east), including 775 islands with many caves and beaches. The adjacent area (buffer zone), which is a national monument and has been ranked by the Ministry of Culture and Information of Vietnam since 1962. The topography of Ha Long is an island, a mountain alternating between sea basins, and a saline area. rising tiger parrots and vertical limestone islands create contrasting beauty, combining harmoniously and vividly the elements: rock, water and sky.