Tombolos are narrow strips of land that connect an island to the mainland or to another island. Synonyms for tombolos include sand spits, bars, sandy causeways, and beach ridges. Beach ridges are formed by the deposition of sediment by wind and waves. Sand spits, on the other hand, are formed by longshore drift and the accumulation of material on the updrift end of a coastline. Bars are similar to sand spits, but can be found offshore and are created by the accumulation of sediment on the seabed. Regardless of the term used, tombolos are valuable features that protect coastlines from erosion and provide unique habitats for plants and animals.