estuary -
the wide part of a river where it nears the sea; fresh and salt water mix
body of water,
water the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"
river a large natural stream of water (larger than a creek); "the river was navigable for 50 miles"
firth a long narrow estuary (especially in Scotland)
estuary -
An ocean inlet also fed by fresh river water.
Wikipedia
An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and ocean environments and are subject to both marine influences, such as tides, waves, and the influx of saline water; and riverine influences, such as flows of fresh water and sediment. The inflow of both seawater and freshwater provide high levels of nutrients in both the water column and sediment, making estuaries among the most productive natural habitats in the world.
OmegaWiki Dictionary
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estuary A river mouth or stream mouth is a part of a river where it flows into the sea, river, lake, reservoir or ocean.
estuary Area at the mouth of a river where it broadens into the sea, and where fresh and sea water intermingle to produce brackish water. The estuarine environment is very rich in wildlife, particularly aquatic, but it is very vulnerable to damage as a result of the actions of humans.\n(Source: WRIGHT)
