Chain O' Lakes State Park, Indiana

The Chain O'Lakes, or simply "The Chain", is a waterway system in northeast Illinois composed of 15 lakes connected by the Fox River and man-made channels. Encompassing more than 7,100 acres (29 km²) of water, 488 miles (785 km) of shoreline and 45 miles (72 km) of river, the Chain is the busiest inland recreational waterway per acre in the United States.

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