Tybee Island beaches are subject to extreme rip currents. The longshore current runs parallel along the eastern seaboard, formed by wind an wave energy crashing and distributing energy along the shoreline. Rip currents are common on the north and south ends of the island, where rushing currents enter and exit the Savannah and Wilmington Rivers. These tidal currents violently collide with the longshore current, generating turbulent water movement. Small rip currents can also occur on the face of the beach during low tide. Strong, sweeping currents flow between breaks in shallow sand bars creating dangerous swimming conditions.