Cutaway illustration of the wide, shallow limestone cavern at River Mile 33 with the Colorado River curving past its mouth, labeled with rock layers and fossils

Redwall Cavern: the river-carved amphitheater that isn't a cave

A limestone alcove at River Mile 33 that Powell guessed could seat 50,000 people — day-use only, no camping, and not legally a cave.

September 23, 2026 · 7 min · 1431 words · Justin