The sea of five flowers is the pride of Jiuzhaigou and the essence of Jiuzhaigou. Wuhua is 2472 meters above sea level. It is formed by the accumulation of landslides and debris flows, travertine and barrier arch valleys. Due to the recharge of Changhai underground lava water system, there are springs overflowing at the bottom of the lake. The recharge amount varies with the seasons, and the lake water level changes in dry season. The dynamic change of lake water level is obviously affected by rainfall. The colour of the Five-Flower Sea is due to the travertine deposits on the seabed, the brilliant algae and the differences in the distribution of submerged plants.