A coastal region where a river meets the ocean and freshwater mixes with saltwater, influenced by tidal changes.
From Latin 'aestuarium,' derived from 'aestus' (tide, surge, heat). The term originally described areas affected by tidal movements and seasonal heating effects.
Estuaries (the modern spelling of aestuary) are ecological superpowers—they're incredibly productive environments where rivers and oceans meet, creating nurseries for countless fish and bird species.
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