Lassen Volcanic National Park is located right where two tectonic plates meet, the Gorda and North American. •• In addition to forming Mt. Lassen, which is an ACTIVE volcano (last erupted about 100 years ago), it forms hydrothermal areas like Bumpass Hell - pictured here - where scalding hot steam and acidic waters discharge from a system below ground. •• When I say hot, I mean the biggest fumarole (opening in the ground) has been measured at 322 F/161 C. Quite literally, roasting temperatures. •• DO NOT leave the trail area here. And in general, always be respectful of signage and rules in National Parks. They are there for your protection, wildlife protection, and environmental protection. Also, falling into acid is bad. Surprising that this needs to be said, but plenty of people have disregarded the signs thinking it’s no big deal, and been seriously injured. •• Be safe and respect nature always! #losethemap (but not here) . . . .