「黄河百害,富于一套」,在平时所说之河套,是按宁夏绥远而言,但在这广大的河套中,宁夏石咀山至绥远安北之西山咀一段,老百姓称之为后套,鸟梁素海位于后套之东北部(黄河以北,乌拉山西北,大青山以南,安北县以东),是后套十余条干渠退水之总枢,每当黄河水位抬高时,海子受灾面积自然扩大。目前海子面积约在七百平方公里,占地约万余顷。老百姓有一句俗话「乌拉素的麦子,滴子成苗」, “The Yellow River is full of pests and is rich in one set.” In the usual case, the “river wrap” refers to Suiyuan in Ningxia. However, in this vast set, the section of Xishanzui between Shizuishan in Ningxia and the northern part of Suiyuan is called by the common people For the back cover, bird beam sea is located in the northeast of the set (north of the Yellow River, north of Wulashan, south of Daqingshan, east of Anbei County), is the back of more than a dozen trunk drainage back to the general pivot, whenever the Yellow River water level When elevation, Haizi affected areas naturally expanded. At present, Haizi area of ​​about 700 square kilometers, covering about ten thousand ares. Ordinary people have a saying “Ulazin wheat, drop into seedlings”