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15万年前,由于地壳运动,草海河段周围地面上升,积水成湖,是为草海的雏形。在之后的演变过程中,历经数度消亡、复苏的沧桑巨变,最终形成了今天长14公里、宽2公里、面积25平方公里,深3米,蓄水量0.6亿立方米的草海。草海,高原之“海”。海拔2171米,位于威宁县城边上。荡舟草海,天高云淡,心旷神怡。草海,“水底草原”。每到夏季,透过清澈湖水,水草葳蕤,碧波连天。
150,000 years ago, due to the crustal movement, the ground around the Caohaihe section rose and the stagnant water flowed into the lake. This was the prototype of Caohai. In the subsequent evolution, the vicissitudes of life after several demise and recovery changed drastically into a grass sea of 14 kilometers in length and 2 kilometers in width with an area of 25 square kilometers, a depth of 3 meters and a water volume of 0.6 billion cubic meters. Caohai, plateau of the “sea ”. 2171 meters above sea level, located in Weining county edge. Swing boat grass sea, sky clear, relaxed and happy. Caohai, “Underwater Prairie ”. Every summer, through the clear lake, water plants, blue sky.