Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Natural geothermal springs in a volcanic canyon inside Lake Mead National Recreation Area on the Arizona side of the Colorado River corridor south of Hoover Dam. A strenuous ~5-mile out-and-back (or loop via White Rock Canyon with a fixed ladder) reaches free-flowing hot water (~111–120°F) in a desert wash; seasonal heat closures apply.