The Etowah River flows through a broad valley south of the downtown, leading west to Rome, where it forms the Coosa River, a tributary of the Alabama River. The city limits extend eastward, upriver, as far as Allatoona Dam, which forms Lake Allatoona, a large U.S. Army Corps of Engineers reservoir. Red Top Mountain State Park sits on a peninsula in the lake, just outside the city limits. Nancy Creek also flows in the vicinity. The highest point in the city is at the summit of Pine Mountain.