South River High School is a public high school located in Edgewater, Maryland, United States, a suburb of the state capital, Annapolis. It lies directly next to Central Middle School. It was built in 1978 due to overcrowding at Arundel High School and Southern High School. It is the primary school for high school students from Edgewater, Mayo, Davidsonville, Riva, and a small portion of Harwood.