威海市地处胶东半岛东部,是块半月形的滨海平原。在城建施工时挖出了埋藏的一些第四系地层,对研究海岸变迁提供了重要资料。 威海市西南15公里有一个双岛港,水域面积近20平方公里,海底浅阔,高潮时水深五米。宋元时代名双岛口,曾经是海防要地。近 Weihai City, located in the eastern part of Jiaodong Peninsula, is a half moon-shaped coastal plain. During the construction of urban construction, some buried Quaternary strata were excavated, which provided important information for studying the changes of the coast. 15 km southwest of Weihai has a Shuangdao port, the water area of ​​nearly 20 square kilometers, shallow sea floor, at the height of five meters water depth. Song and Yuan Dynasties name double island, once a coastal defense. near