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The Norwalk River is a river in southwestern Connecticut, approximately 23 miles long. The word "Norwalk" comes from the Algonquin word "noyank" meaning "point of land".

The Norwalk River originates in ponds located in Ridgefield, Connecticut. These ponds empty into Ridgefield’s approximately 500-acre "Great Swamp". The river continues through Ridgefield, and is augmented by the "Great Pond" (507 feet above sea level), one of the purest lakes in Connecticut due to its being fed by underwater springs. The river is closely paralleled by US 7 as it flows southward through Branchville, Georgetown, Wilton, and Norwalk, where it is joined by the Silvermine River and then flows into Norwalk Harbor and finally into Long Island Sound.

Recreational fishing continues to be a popular sport along the course of the river, in addition to oystering at the river’s mouth in Norwalk.