Er sea, xie Yu lustre, elder brother ever was called in archaic document river of Mi Chuan, Xi Er, on the west 2 rivers, be located in Yunnan Dali suburb, save lake of the 2nd big fresh water for Yunnan. Er sea north has Er cause, grow about 42.58 kilometers, the thing is the biggest width 9 kilometers, lake area area 256.5 square kilometer, average lake is deep 10 meters, the biggest lake is as deep as 20 meters. Er sea water quality is good, aquatic resources is substantial, also be a beauty spot that having meandering view at the same time. Er sea, although say for the sea, but it is actually laky, because Yunnan resides inland greatly,be allegedly, people of the Bai nationality is those who represent pair of of great capacities is yearning, the sea is Er that says so. Ever was called in archaic document: River of Er river, foliaceous Yu river, Xie Yu lustre, cover, " elder brother Mi Chuan " , the name such as Kunming pool, by Xi Er river cave in is formed, downy and laky, appearance as ear, sea of friend name Er. Although the area is large without pool of another name for Yunnan Province, but because water level is deep, store water amount is larger than pool of another name for Yunnan Province however. Sea of Cang Shan Er, landscape depend on each other. The lake of Zi green jade that Er sea sends county of source of source Yu Er, fountainhead out stops Gu Shan, north has infuse of cover straight river, southeast stops pineapple river water, on the west Na Cangshan 18 brooks water, total runoff area 2565 square kilometer, the area makes an appointment with 251 square kilometer, store water measures 3 billion stere, average depth of water makes an appointment with 11.5 meters, most deeply 20 meters. Have on the history " the forgive of the channel that enjoy fishing, the Tian Zhili that occupy silt " account, two side have delta thing the shallow lake bay with fascicular aquatic, for fish multiply gives birth to the good place of breath, aquatic product of all through the ages is rich, place is called " piscine earth boiler " . According to " annals of Xi Er sea " the cloud: Er | | | The sea " piscine a group of things with common features is quite much, inspect his water place to go out more beautiful, wintry dear armour at Zhu Jun. The four seasons of emperor of fierce of the Kingdom of Wei feeds make: "Fish of sew of pool of another name for Yunnan Province, extremely solstitial beautiful " . Er seawater is produced resourceful, teem with fish of fish of carp, Gong Yu, fish glue, fine scale fish, crucian carp fish, grass carp, catenary, black carp, shrimp, crab to wait for more than 10 kinds. Produce per year tens of 10 thousand jins, among them with Gong Yu most famous, body body is chief thin, scale fine pork is fresh, " of so-called " Yu Kui, place is called " piscine earth boiler " , it is the special local product of Er sea. Er sea is people of the Bai nationality " maternal lake " , the Bai nationality first civilian those who say for " Jin Yueliang " , the downy fresh water that is beautiful fawn on of a scene is laky, have advantageous area advantage, remarkable integrated function, the historical culture of massiness, favorable development environment, it is the cradle of Dali politics, economy, culture, also be the base that autonomous prefecture economy can expand continuously. Look downward from inside sky, er Hai Wanru round of crescent, depend on silently lie to be mixed in Cang Shan Dali dam child between. Climate of Er sea area is friendly, year average air temperature 15.7 ℃ , highest air temperature is 34 ℃ , lowermost air temperature is - 2.3 ℃ , lake water is not frozen. Year average fall 1200 millimeter of 1000 ～ .