Definitions for "Barrier island"
Keywords:  mainland, sandy, lagoon, beach, island
narrow islands of sand that run parallel to the shoreline. They are separated from the mainland by a river, marsh, or lagoon. Inlets separate adjacent barrier islands. Barrier islands function as a buffer for the mainland against storms and heavy surf.
An offshore sand bar that rises above the mean high-water level, forming an island.
long, narrow island, built largely of beach sand, parallel with the mainland and separated from it by a lagoon
Keywords:  sandbar, meters, feet, wide
a sandbar that is more than 100 meters (328 feet) wide
a dynamic ecosystem that tends to migration towards land over geologic time