Ha Long Bay became one of the New 7 Natural Wonders of the world, recognized by UNESCO twice as a world natural heritage on December 17, 1994 and December 2, 2000. UNESCO title includes list of world heritage, world biosphere reserve, world documentary heritage, global geopark, intangible cultural heritage of humanity ... In the system of UNESCO titles, world heritage is the most prestigious and oldest title. The beauty of Ha Long Bay is made up of 3 factors: rock, water and sky. Halong Bay has an area of ​​about 1,553km2, including 1,969 islands, the core area of ​​the bay has an area of ​​334km2 with more than 775 islands of all sizes, mostly limestone islands, rich cave system. In the bay, there is a unique landscape of the rocky island of Ha Long with a variety of shapes and colors of the mountain island, blending with the sea and sky to create a magnificent ink picture. Ha Long has a great cultural, spiritual and spiritual significance, expressed through the legend of the Dragon and the Fairy ... through significant historical evidence such as Van Don commercial port, Bai Chay victory, Bai Tho mountain history, naval battle of Dau Go Cave ...