The famed Outer Banks of North Carolina are a slim and moving line of sand in the open Atlantic. Many travelers think they know these islands -- but south of Ocracoke Inlet there rises a luminous bar of sand 60 miles in extent, with no roads, no bridges, no hotels: the wild beaches of Cape Lookout, one of the few remaining natural barrier islands in the world. "Ribbon of Sand" examines this seascape and the transitory islands doomed to disappear. The film features quotes by environmental pioneer Rachel Carson as interpreted by actress Meryl Streep.