Deveaux Bank is a horseshoe-shaped sand spit island encompassing a 215-acre (87-hectare) bird sanctuary at the mouth of the North Edisto River in Charleston County, South Carolina. It is located on the Atlantic Coast between Edisto Island, South Carolina and Seabrook Island, South Carolina. Its average elevation is three feet. It has approximately 2.75 miles (4.43 kilometres) of sandy beaches on three sides (some of which are completely submerged at high tide) and a tidal lagoon on the side facing the mainland.