Potomac
/pəˈtəʊmək/- a river of the eastern US, which rises in the Appalachian Mountains in West Virginia and flows about 459 km (285 miles) through Washington DC into Chesapeake Bay on the Atlantic coast.波托马克河（美国东部河流, 发源于西弗吉尼亚州的阿巴拉契亚山脉, 流程约459公里, 即285英里, 经华盛顿特区注入大西洋沿岸的切萨皮克湾）。