Erhai ancient literature had called Ye Yuze, MI Chuan Kun, Xi'er River, west of the two river, located in the Yunnan suburb of Dali, in Yunnan Province as the second largest freshwater lake, Erhai, north of Eryuan, about 42.58 km long, what the maximum width of 9 km, the lake area of 256.5 square kilometers, the average 10 meters deep lake, the largest lake depth of 20 meters. Erhai has two outlets: 1 in Xiaguan town near by, the outflow of Xierhe; 2 "lead Er into the bin". Erhai is one of four Dali "romantic themes" King "Erhai month" where. It is said that because the shape like an ear and named as "Erhai". Erhai good water quality, abundant marine resources, but also a Yili scenery scenic area. 洱海古代文献中曾称为叶榆泽、昆弥川、西洱河、西二河等，位于云南大理郊区，为云南省第二大淡水湖，洱海北起洱源，长约42.58公里，东西最大宽度9.0公里，湖面面积256.5平方公里，平均湖深10米，最大湖深达20米。洱海有两个出水口：1.在下关镇附近，经西洱河流出；2.“引洱入宾”。洱海是大理“风花雪月”四景之一“洱海月”之所在。据说因形状像一个耳朵而取名为“洱海”。洱海水质优良，水产资源丰富，同时也是一个有着迤逦风光的风景区。
温馨提示：答案为网友推荐，仅供参考