Back River (Maryland)
 Back River is a tidal estuary in Baltimore County Maryland located about 2 miles (3 km) east of the city of Baltimore. The estuary extends from the community of Rosedale southeast for about 8.8 miles (14.2 km) to the Chesapeake Bay. The watershed area is 39075 acres (15813 ha) and includes Essex Skypark Airport and the Back River Wastewater Treatment Plant.