The world's natural Ha Long Bay is recognized by UNESCO as a valuable cultural document that needs to be protected.The breathtaking water landscape on the Bay is made up of more than 1600 large and small limestone islands in the emerald green waters typical of Ha Long Bay. This is also the place to witness the changes in the development history of the Earth. The limestone columns are covered by rows of deep green tropical trees, together with a system of magnificent limestone caves and caves. Ha Long Bay was recognized by UNESCO as a World Natural Heritage for the first time in 1994 for its unique and aesthetically important values ​​of natural landscapes. In 2000, Ha Long Bay was honored for the second time to be recognized by the typical geological and geomorphological values, through the process of tectonic Earth over billions of years.

Ha Long Bay is a small bay in the western part of the Gulf of Tonkin in the northeastern sea area of ​​Vietnam, including the island waters of Ha Long city, Cam Pha city and a part of Van Don island district of Quang Ninh province.

Being the center of a large area with more or less similarities in geology, geomorphology, landscape, climate and culture, with Bai Tu Long Bay in the northeast and Cat Ba archipelago in the southwest, Halong 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 covers an area of ​​335 km², dense conglomerating 775 islands. The karst geological formations of the bay go back about 500 million years with very different geographic circumstances; and a full carvoid evolution over 20 million years with a combination of factors such as thick limestone beds, hot and humid climates and slow tectonic lift overall.  The combination of environment, climate, geology, and geomorphology has made Ha Long Bay a cluster of biodiversity including tropical moist evergreen closed forest ecosystem and marine and coastal ecosystem. shore with many sub-ecosystems.  17 endemic plant species  and about 60 endemic animal species  have been identified among the thousands of flora and fauna that inhabit the bay.

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