Forum Discussion
qtla9111
Dec 17, 2016Nomad
The term "shut-in" refers to a place where the river's breadth is limited by hard rock that is resistant to erosion. In these shut-ins, the river cascades in many rivulets over and around igneous rocks worn smooth over many eons. It is used by park visitors as a natural water park when the water is not so high as to be dangerous.
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