noun
lagoon
luh-GOON/ləˈɡuːn/
A shallow body of water separated from the open sea by a natural barrier.
A narrow strip of sand separates the lagoon from the ocean.

Etymology
Latin lacuna joins the ideas of a pond and a hollow. In English, the word named shallow coastal water around Venice, then also the lake-like water enclosed by an atoll.
In context
truck lagoon it's about 20 odd miles and 11 kilometers across and it was protected from the pacific ocean currents etc
More examples
- A coral reef shelters the lagoon from ocean waves.
- Seawater enters the lagoon through a gap in the dunes.
- Shorebirds feed along the edges of these coastal lagoons.
Forms
lagoon · lagoons