 spring, and that's obviously for safety reasons, as well as for environmental reasons. But once the spring has left its source and mixed with cold water, it's deemed safe to bathe. And so there's a handful of places around where you're not breaking the rules because you're not bathing in the source itself. And there's two springs down in the southern part of Yellowstone, which are just epic hikes to incredible springs. Denunda Falls is at the base