noun

estuary

estuary, river mouth

The river flows into a wide estuary.

The river flows into a wide estuary.

Many birds live in the salt marshes of the estuary.

Many birds live in the salt marshes of the estuary.

the estuary of ((a river)) The Thames Estuary is very wide.

Synonyms: inlet, river mouth, firth, delta (though technically different)

From Latin 'aestuarium' (tidal part of a shore), from 'aestus' (tide, heat, surge).

Picture where a river meets the sea and is affected by the tide. It's where fresh and salt water mix.

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