Rock River

(redirected from Rock (river, United States))
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Rock River,

c.285 mi (460 km) long, rising in SE Wisc. and flowing SW through NW Ill. to the Mississippi River near Rock Island. It flows through a fertile farm area. Rockford, Ill., is the chief city on the river. Lake Koshkonong (c.20 sq mi/50 sq km) is a natural widening of the river.

rock river

[′räk ‚riv·ər]
(geology)
A very long and narrow rock stream.