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.