从明代到清代的前期，滔滔东去的黄河，在河南兰阳（今兰考县境内）折向东南，经由徐州，于江苏滨海县人海。大河掉头的地方，受洪水冲击时，又是旋涡，又是大浪，历来被视为河防的险关，守河的官民谁个敢小觑了它，不但修了重埽，而且筑起了当年少见的石砌厢护，并在那护厢之 From the Ming dynasty to the early Qing dynasty, the Yellow River that ransacked the east went straight to the southeast through Lanyang (present-day Lankao County) in Henan Province and the sea of ​​people in Binhai County, Jiangsu Province via Xuzhou. Where the river turned around, when it was hit by the flood, it was a whirlpool and a big wave. It has always been regarded as a danger of river defense. The officials and officials who defended the river dared underestimate it. It not only built a bridge, but also built a rare Stone box guard, and in that escort car