Chain of Rocks refers to a region of exposed bedrock in a riverbed. It may refer to multiple locations near the Illinois-Missouri border: Chain of Rocks, Missouri, a small town northwest of St. Louis The old Chain of Rocks Bridge, now restricted to pedestrian and bicycle traffic The New Chain of Rocks Bridge, its vehicular replacement The Chain of Rocks Lock, a river-navigational structure nearby The former Chain of Rocks Amusement Park site nearby