Changhai is the highest sea level and widest Lake in Jiuzhaigou. The water surface of Haizi is dark blue. The water source comes from melting snow in the mountains. Surprisingly, there is no water outlet around Changhai, but the water does not overflow the dike in summer and autumn, and the drought in winter and spring does not dry up. Therefore, the local people in Jiuzhaigou call it the treasure gourd that can not be dried up. There are more than 100 meters deep in the lake, distributed in S-line. The forest around Haizi is green, and the peak is covered with snow all the year round. In the middle of winter, the ice layer of the long sea is 60 cm thick, which is an ideal place for ice sports.

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