sentences:  For example, the Beaufort River separates Port Royal Island and St Helena Island, while connecting Port Royal Sound Saint Helena Sound via Brickyard Creek and the Coosaw River.Skull Creek and Mackay Creek separate Hilton Head Island from the mainland, while connecting Port Royal Sound to Calibogue Sound.A waterway called Whale Branch separates Port Royal Island from the mainland, while connecting Port Royal Sound and the Broad River to Saint Helena Sound, via the Coosaw River.