Greenwood, Lake, reservoir (c.20 mi/32 km long), in Newberry, Laurens, and Greenwood cos., W central S.C., on Saluda R. (Newberry/Greenwood co. border), 14 mi/23 km E of Greenwood; 34°12'N 81°55'W. Reedy R. forms N arm (6 mi/9.7 km long). Formed by Buzzard Roost Dam, built for hydroelectric power. Lake Greenwood State Park on SW shore.