A lagoon is a shallow body of water separated from a larger sea or ocean by sandbanks, coral reefs, or islands.
From Italian *laguna*, meaning pond or lake, related to Latin *lacus* for lake. The word originally referred to the network of shallow waters around Venice.
The dreamy “blue lagoon” you picture is literally just a protected piece of ocean, sheltered by natural barriers. The word is a cousin of *lagoon*, *lagoon*, and *lake*, all swimming in the same family of “still waters.”
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