Lagoons
From CopperWiki
Lagoon refer to both the lagoons in atolls, formed by the growth of coral reefs and coastal lagoons formed by the build-up of sandbanks.
They are shallow coastal bodies of water separated from the ocean by a series of barrier islands which lie parallel to the shoreline. Inlets, either natural or man-made, cut through barrier islands and permit tidal currents to transport water into and out of the lagoons.
References
- What is a lagoon?