A trip to North Vietnam is like a waste of time if you don't visit the Halong Bay. Located in the suburbs east of Hanoi, it takes about two hours' drive to get there. Known as the " Guilin on the Sea", Halong Bay belongs to karst landform. There are strangely-shaped rocks of different sizes over the bay which covers an area of 1553 square kilometers, forming a spectacular view at sea. In 1994, it was listed as the World Natural Heritage by UNESCO. Perhaps affected by China, Vietnam also likes dragons a lot. Hanoi used to be called "Ascending Dragon". There is even a legend about dragon in Halong Bay. It's said that in order to prevent the attack from enemies, the flying dragon sprayed jade stones from its mouth and these jade stones became the strangely-shaped rocks scattered at sea.