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黄河下游河道在兰考东坝头以南有明清时代的河道(以下简称明清故道),亦称“南河”。清咸丰五年(1855年)以前,经河南商丘、虞城,山东曹县、单县,江苏丰县、沛县和砀山至徐州合泗夺淮,经涟水由云梯关东注黄海。1855年在兰考铜瓦厢改道后,经河南长垣、濮阳、范县,山东菏泽、梁山县夺大清河,经济南由利津东注渤海,即为现行河道。而东坝头以上到沁河口这段河道,既是明清故道的上游河段,也是现行河道的上游河段。黄河这段
The lower reaches of the Yellow River in Lankao Dongba head south of the Ming and Qing era of the river (hereinafter referred to as the Ming and Qing dynasties), also known as the “South River.” Qing Xianfeng five years ago (1855), the Henan Shangqiu, Yucheng, Shandong Cao County, Shanxian County, Fengxian County, Pei County and Dangshan Xuzhou Sihe Huai Huai, Lianshui by the ladder Kanto Yellow Sea. After the diversion of the copper roof tiles in Lankao in 1855, the river was overthrown by Henan Changyuan, Puyang, Fanxian, Shandong Heze and Liangshan County, and the economic south was injected with Bohai Sea by Lijin East. The dam east of Qinhekou this channel above, both the upper reaches of the old course of the Ming and Qing dynasties, but also the upper reaches of the current river. This section of the Yellow River