The Ashley River is a blackwater and tidal river in South Carolina, rising from the Wassamassaw and Great Cypress Swamps in western Berkeley County. It consolidates its main channel about five miles west of Summerville, widening into a tidal estuary just south of Fort Dorchester. The river then flows for approximately 17 mi (27 km) along the historical banks of the City of North Charleston before reaching peninsular Charleston. The much wider Ashley joins the Cooper River off the Battery in Charleston to form Charleston Harbor before discharging into the Atlantic Ocean. As of 2012 the land around the Ashley River is mostly undeveloped.

Summerville is a town in the U.S. state of South Carolina situated mostly in Dorchester County, with small portions in Berkeley and Charleston counties. It is part of the Charleston-North Charleston-Summerville, SC Metropolitan Statistical Area. Summerville's population at the 2020 census was 50,915.