一、基本情况:黄河发源于青海,经流九省,干流长约四千六百公里。主要的支流有五十多条,流域面积七十七万平方公里。若是把下游的受灾区域计算在内,人口有一亿左右。上游在青、甘两省,穿行于山谷之间。到宁、绥两省便行经高原。中游于绥远的托克托以下,又入山地、界分晋、陕两省;南至龙门而稍放,复于潼关折而东行,再入山 First, the basic situation: the Yellow River originated in Qinghai, the flow of nine provinces, the main stream of about 4600 kilometers. There are more than 50 major tributaries and the drainage area is 700,000 square kilometers. If we take the affected area downstream into account, the population is about 100 million. Upstream in Green, Gansu provinces, walk through the valley. To Ning, Sui two provinces will go through the plateau. The middle reaches of Tuoketuo in Suiyuan, and into the mountains, the boundaries of Shanxi, Shaanxi provinces; south to the gantry and slightly placed, complex in the east off Tongguan, re-entry into the mountains