A lagoon is a body of water formed along the shore as barrier islands migrate shoreward and isolate a body of water from the open water. A tidal inlet usually connects the lagoon to the sea, and although the water is salty, large rivers and streams often provide fresh water which reduces the salinity. The lagoons are often the sites of dense marsh vegetation, principally grasses. Eventually, the lagoon will fill with sediment and plant debris to become a marsh or swamp.
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