|Location:||Redwall Cavern, Marble Canyon, Colorado River. Between Powell Lake and Grand Canyon. The cave is only accessible on a boat trip through the Grand Canyon.|
|Classification:||river cave in sandstone|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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This cave was first seen by Powell and his companions, as they were travelling down the Colorado. He estimated, this cave would be big enough to seat 50.000 people!
This large cavern seem to be an erosive river cave in sandstone, made by the Colorado River. The ground of the cave is sand, also a remains of the river.