lagoon
nounUK /ləˈɡuːn/
US /ləˈɡuːn/
A shallow pool of water that is separated from the sea by sand or rocks.
We swam in the warm lagoon behind the beach.
OTHER MEANINGS
2. The shallow water enclosed by a coral reef.
The lagoon was full of colorful fish and coral.
3. A small artificial pool used to treat or store water.
The factory built a lagoon to hold its wastewater.
4. A pond or small lake near a river.
Ducks gathered at the lagoon beside the river.