This article relies on a single source. (September 2026) |

St. Simons Sound is a sound in Georgia that prevails between Jekyll Island and St. Simons Island. It is part of the waterway from the Atlantic Ocean to the South Brunswick River to the port at Brunswick, Georgia. The St. Simons lighthouse stands on the north side of the sound. The depth of the sound is determined to be 32 feet (9.8 m) through a channel of treacherous shoals.