What is a lagoon?
A lagoon is marine water or freshwater that is near to, but separated from, a larger body of water by a natural barrier or several natural barriers. It occurs in oceans and near the coast. Some lagoons have brackish water, which is a mixture of sea water and freshwater from a river mouth at the coast.
The natural barrier between the small and large body of water can be a reef or a sandbar.
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What’s the difference between freshwater, saltwater, and brackish water?
Freshwater is water, without salt or other minerals, that occurs naturally, such as in rivers, streams, ice caps, glaciers, bogs, ponds, and groundwater.
Saltwater is sea water that occurs in the ocean and in marine environments, such as salt lakes, salt pans, and brine pools. It is salty. It has a high salinity level.
Brackish water occurs in areas where the seawater from the ocean meets the freshwater from a river, such as in estuaries. An estuary is on the coast, where a river meets the sea. It is a transition zone.