Located in Quang Ninh province abundant in open coal mines.
Water color is emerald.
Ha Long appeared in the first epoch as the huge limestone scattered in the delta of the delta of the Red River full of alluvium. It is a mysterious, magnificent and unique bay in the world. There are many remarkable grottoes like the Pelican cave, Dau Go, Tam Cung, Thien Cung, and tunnels like Hanh built up by wind and tide. They all have been covered by green and dense vegetation. Legends said that a huge dragon and its children descended there to help the Vietnamese fight against Northern invaders.