Firehole River Canyon, Yellowstone National Park, Wyoming
In Yellowstone National Park all of the geysers and hot springs fall under the look-but-don't-touch rule. But this warm swimming hole, fed by distant thermal features, is one of only two spots in the park where you're allowed to take a dip. Near the park's western entrance, the Firehole River Canyon pool hits the spot after a long day of summertime sightseeing. Adventurous swimmers like to work their way upstream a bit before jumping into the rapids for a ride through the canyon. The main pool is shallower and better for younger kids.
What's Nearby: Old Faithful is a short drive south along the main park road. The uncrowded, one-way Firehole Canyon Drive takes you past 800-foot-thick lava flows and the 40-foot-high Firehole Falls. You can camp at Madison campground near the West Yellowstone entrance.
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