Shut-in (river)

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A shut-in is an Ozark term for a river that's naturally confined within a deep, narrow channel. The river becomes unnavigable even by canoe due to a dike of harder rock that is more difficult to erode. The dike diverts the stream into many little streamlets, often fountainlike, "shutting" the river.

Examples can be found in Johnson's Shut-Ins State Park in Missouri, where the Black River has become confined in a shut-in.