lagoon

American  

[luh-goon] / ləˈgun /

noun

1. an area of shallow water separated from the sea by low sandy dunes.

2. Also lagune any small, pondlike body of water, especially one connected with a larger body of water.

3. an artificial pool for storage and treatment of polluted or excessively hot sewage, industrial waste, etc.

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lagoon British  

/ ləˈɡuːn /

noun

1. a body of water cut off from the open sea by coral reefs or sand bars

2. any small body of water, esp one adjoining a larger one

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lagoon Scientific  

/ lə-go̅o̅n′ /

1. A shallow body of salt water close to the sea but separated from it by a narrow strip of land, such as a barrier island, or by a coral reef.

2. A shallow pond or lake close to a larger lake or river but separated from it by a barrier such as a levee.

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Other Word Forms

• lagoonal adjective

Etymology

Origin of lagoon

1605–15; earlier laguna (singular), lagune (plural) < Italian < Latin lacūna (singular), lacūnae (plural) “ditch, pool,” akin to lacus basin, lake ¹; lacuna

Explanation

If you are snorkeling off the coast of Florida in water cut off from the main ocean, you are likely in a lagoon — a body of water separated from the main ocean. If you’re familiar with the 60s TV show “Gilligan’s Island,” you probably already know what a lagoon is. Much of the show’s action took place at the lagoon, where the lovable castaways spent their time hanging around and planning how to be rescued. A lagoon is a good place for castaways to congregate because it’s shallow and separated from the ocean by a natural barrier, which means it’s protected from the rough waters of the ocean and offers easier access for swimming and fishing. If you’re ever stranded on a deserted island, you too would probably choose to spend your time at the lagoon, staring into the distance and watching for approaching ships.

Example Sentences

Initially, “Lord of the Flies” is all childish adventure: swimming in a lagoon, climbing a mountain.

From The Wall Street Journal • Feb. 17, 2026

These tracks were formed on the muddy edge of a lagoon around 170 million years ago and have puzzled scientists for decades.

From Science Daily • Feb. 1, 2026

Weeks before the Makoko demolition, bulldozers levelled dozens of houses in the Oworonshoki neighbourhood on the opposite side of the lagoon.

From Barron's • Jan. 16, 2026

“When we started going, there would be 400 adult whales in the lagoon, including 100 moms and their babies,” he told me.

From Los Angeles Times • Jan. 8, 2026

Powerful arms encircled me, dragging me from the dark lagoon and onto the cold porcelain floor.

From "The City Beautiful" by Aden Polydoros

Related Words

• bayou
• pond
• pool