一、小北干流现状黄河禹门口至潼关河段称之谓(黄河)小北干流。长132公里,面积1130平方公里,穿行于汾渭源阶地区,垣台高出河床50至200米。小北干流是山陕两省的天然省界。小北干流地处汾渭地堑,北为吕梁背斜,西为鄂尔多斯中拗陷,南为秦岭地轴,东南为 First, the status quo of the small northern main Yellow River Yumenkou to Tongguan River called the so-called (Yellow River) small North Mainstream. 132 kilometers long, an area of ​​1130 square kilometers, walk through the Fenweiyuan area, Yuantai higher than the riverbed 50 to 200 meters. Small North Mainstream is the natural province of Shanxi and Shaanxi provinces. Small north main stream is located in Fenwei Graben, Luliang anticline in the north, Ordos depression in the west, the south axis of the Qinling Mountains, southeast