A "sand spit" refers to a long, narrow strip of beach land that extends into the water. It is formed by the deposition of sand and sediment carried by waves and currents. Full definition
With its long sand spit separating the lagoon from the ocean, Big Lagoon State Park is a beachcombing paradise, and if one is willing to walk far enough you can truly be alone. (lostwhaleinn.com)
The California Pacific coast resident population usually congregates on sand spits and dune - backed beaches. (nps.gov)
The outer barrier reef is full of sand spits with coconut palms. (aqua-vision.net)