Hot Creek near Mammoth Lakes (California).
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A number of hot springs and steamy geysers mix with the cold water of this small mountain stream, bringing its temperature to that of a warm bath at certain locations. The place is dangerous due to unstable ground and sudden eruptions of scalding hot water. People bathe there at their own risks, and some people have been killed or seriously injured there. But it's a beautiful place, and definitely worth a bath if you know and accept the risks (including getting cited for trespassing the warning signs!).
For more info about this location, go to en.wikipedia.org/wiki/Hot_Creek_(Mono_County,_California).
Hot Creek is located in the "Long Valley Caldera", the mouth of an old super volcano, a region with many hot springs. For more info about this region, go to: