a watershed area of more than 10 square kilometers, and seven have a watershed area of more than 300 square kilometers and a river length of more than 30 kilometers, all of which belong to the Haihe River system. Hutuo River and Mianhe River are the main rivers in the territory. Hutuo River flows through the northern part of the city, is the Haihe River system of the five major rivers of the north source of the Ziya River, in the territory of the main tributaries are Wuhe, Longhua River, Shitang River and so on. The Mianhe River is formed by the confluence of the Wenhe River and the Taohe River, distributed in the middle and south of the city; after leaving the country, it converges with the Gantao River (Songxi River) and flows into the Hutuo River. There are also a number of rivers that leave the country directly. History Yangquan City has a long history, according to the 1950s from Pingding northwest jujube smoke, Daliangding and other places unearthed cultural relics, the Middle Paleolithic Age, there will be human survival and reproduction here. During the Tang, Yu, Xia and Shang dynasties, Yangquan City was handed down to be the place of ancient Jizhou. During the Spring and Autumn period, there was a hatred of Judah in Yuxian County. Zhou Zhending king twelve years (457 years ago), Jinqing Zhibo extermination of feud; sixteen years (453 years ago), Han Zhao Wei three Jin, the city belongs to Zhao. Qin belongs to Taiyuan County. At the beginning of the Western Han Dynasty, Shangai County was located in the city, and the county governance was in Xincheng Village, Pingding County, which belongs to Taiyuan County. In the Eastern Han Dynasty, Shangai County belongs to Changshan State of Jizhou. When the three Kingdoms, the north and south belong to Wei and state Leping County, Xinxing County. The old system of Cao and Wei was used in the Western Jin Dynasty. During the Sixteen Kingdoms of the Eastern Jin Dynasty, it belonged to Qian Zhao, Hou Zhao, ran Wei, Qian Yan, Qian Qin, Hou Yan, Northern Wei and other countries. During the Northern Wei Dynasty, the north and south belonged to Shiai County, Leping County, and Dingxiang County, Xinxing County, Wangzhou. After the whole territory belongs to the Eastern Wei Dynasty and the Northern Qi Dynasty. Sui in this Niangzi Wei Ze County, is