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estuary
An estuary is a semi-enclose coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries are often associated with high rates of biological productivity.
Trivia about estuary
Unlike a delta, it's a deep, broad mouth of a river; the Amazon's stretches several hundred miles upstream
"Firth" is a synonym for this broad mouth of a river into which the tide flows