The Dragon King Pool is found in the center of a large park behind the Potala Palace. It dates back to the rebuilding of the Potala by the 5th Dalai Lama in 1645. 

It is said to be man-made naturally produced from the huge amounts of earth removed for the construction of the Potala. 

The name Dragon King Pool however stems from a popular legend in Tibetan mythology. Many, many years ago the area of Lhasa contained a large and turbulent lake. Prince Guoja ruled the area but was constantly hampered by an evil dragon that lived in the lake. This dragon caused many floods and brought misery to the people. The only way of placation the dragon was to offer a human sacrifice. Thus every year a young boy from the populace was chosen, and on the 1st day of the 1st month, according to the Tibetan Calendar, he was tossed into the lake and never seen again. One year, while searching for a suitable sacrifice, the Prince's men discovered a small monk called Dwenjue, who lived on a mountainside with his poor family. On the appropriate day, Dwenjue was thrown into the lake. Unlike his predecessors however, this boy had special magical powers, and after a bitter struggle lasting 7 days and nights, the dragon was slain. From that day on, the area became prosperous, and the people were happy. 

In more recent years, a 4-story pavilion was built on an island in the lake. It contains a shrine dedicated to the Dragon King. 

Surrounding parks there are many trees and flowers and scenic picnic spots. Recently children's playground and garden restaurant have been added. 

In the summer, people go boating on the lake and in the winter it is perfect for ice-skating.