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Ossabaw Island Foundation Our Mission the Rookery Give built Environment Ossabaw Island Learn More Beaches Ossabaw Visit Ossabaw Welcome to the Ossabaw Island Foundation Island At approximately 26000 acres Ossabaw Island is Georgias third largest barrier island. Nearly 9000 acres are high ground the remainder is tidal wetlands. The island is roughly 10 miles long and 7 miles wide at its widest point. Ossabaw is bordered by the Atlantic Ocean to the east the Bear River Florida Passage of the Intracoastal Waterway to the west the Ogeechee River to the north and St.