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The Rock River is a tributary of the Mississippi River, approximately 299 miles long, in the U.S. states of Wisconsin and Illinois. The river was known as the Sinnissippi to the Sauk and Meskwaki peoples; the name means "rocky waters".
Country: United States
States: Wisconsin, Illinois
Length: 299 mi (481 km)
Progression: Rock River → Mississippi → Gulf of Mexico
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