Where are the guards leading Huang Jiwei?

Weihe River originates from the southern foot of Taihang Mountain, and the main stream below Hehe River is 283 kilometers long. Xinxiang, Weihui, Xunxian, hua county, Tangyin, Neihuang, Qingfeng and Nanle in Henan Province, wei county and Daming in Hebei Province, and guanxian in Shandong Province join Zhanghe River in Xuwancang. The basin area is 15830 square kilometers, the northwest mountainous area is 6280 square kilometers, and the southeast plain area is 90 10 square kilometers. The main tributaries are Qihe River, Tanghe River and Anyang River. It is distributed in the left bank of the main stream in a comb shape, with short source and rapid flow and sudden flood. The main stream is curved, and the river is narrow and deep. It is a winding river.

Weihe River has a long history. The Weihe River below Qimen, formerly known as Baigou, is the old course of the Yellow River. In the ninth year of Jian 'an (2004), Cao Cao stopped water from flowing into Baigou and developed shipping, which basically formed the situation of Weihe River today. It became Yongji Canal in Sui and Tang Dynasties and Yu He River in Song Dynasty. Its business purpose is to develop waterway transportation, which has played an important role in the economic development of northern China.

Historically, the Weihe River has been slow in flood discharge, its dikes have burst and floods have occurred frequently. After the founding of People's Republic of China (PRC), the Weihe River has been treated and dredged many times. Among them, after the expansion of 1978 ~ 1983 Weihe River main stream, the flood discharge below Weihe River mouth in flood season now reaches 2000 ~ 2500 cubic meters, and the drainage flow reaches 700 ~ 1000 cubic meters, which is more than double that in the early days of liberation.