洱海（Erhai）

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洱海，古称昆明池、洱河、叶榆泽等。位于云南省大理白族自治州大理市。一般湖水面积约246平方千米（一说252平方公里），蓄水量约29.5亿立方米，呈狭长形，北起洱源县南端，南止大理市下关，南北长40公里，是仅次于滇池的云南第二大湖。洱海形成于冰河时代末期，其成因主要是沉降侵蚀，属高原构造断陷湖泊，海拔1972米。洱海，属澜沧江流域，系其支流漾濞江支流西洱河上源。湖水由西洱河流经大理市区下关，向西汇入漾濞江。洱海具有供水、农灌、发电、调节气候、渔业、航运、旅游七大主要功能，洱海西面有点苍山横列如屏，东面有玉案山环绕衬托，空间环境优美。
Erhai Lake was called Kunming Lake, Erhe River, Yeyuze and so on in ancient times. Located in Dali City, Dali Bai Autonomous Prefecture, Yunnan Province, it is the second largest lake in Yunnan after Dianchi Lake. Erhai Lake was formed at the end of the Ice Age, mainly due to subsidence and erosion. It is a fault-depressed plateau lake with an altitude of 1972 meters. Erhai Lake belongs to the Lancang River Basin, and is the upper source of the Xi'er River, a tributary of its tributary, the Yangbi River. The lake water flows from the Xi'er River through Xiaguan, Dali City, and flows westward into the Yangbi River. Erhai Lake has seven main functions of water supply, agricultural irrigation, power generation, climate regulation, fishery, shipping, and tourism. There are Cangshan Mountains in the west of Erhai Lake like a screen, surrounded by Yuan Mountain in the east, and the space environment is beautiful.