Callawassie Island is one of hundreds of barrier and sea islands in the southeast corner in the outer coastal plain, making up a portion of Beaufort County, South Carolina. Callawassie Island is centrally located 17 miles southwest of Beaufort, South Carolina, 30 miles northeast of Savannah, Georgia, and 275 miles southeast of Atlanta, Georgia. The island is t…Callawassie Island is one of hundreds of barrier and sea islands in the southeast corner in the outer coastal plain, making up a portion of Beaufort County, South Carolina. Callawassie Island is centrally located 17 miles southwest of Beaufort, South Carolina, 30 miles northeast of Savannah, Georgia, and 275 miles southeast of Atlanta, Georgia. The island is ten to twelve miles inland from the Atlantic Ocean in the estuarial system of the Port Royal Sound and is entirely surrounded by salt marshes and tidal creeks. Access to Callawassie is by a half mile causeway, one mile south of SC 170, or by boat via the deep waters of the Colleton River. The island's 880 acres are nestled at the confluence of the Callawassie Creek and the Little Chechessee, Okatie, and Colleton Rivers. With five miles of waterfront on the salt marshes of the Port Royal Sound Basin, Callawassie Island is a major supporter of the state-of-the-art Maritime Center, run by the Port Royal Sound Foundation located on Lemon Island.