The US has 169 volcanoes that could erupt, including 50 that are considered “high priority” for monitoring. Here is where they are.

Volcanoes are full of tricks. They can build to a major eruption in a crescendo of shudders and spatters or explode with almost no warning. They can lie in wait under a magnificent snowcap, the centerpiece of a landscape of beauty that they could obliterate tomorrow, or in 10,000 years, or never again. And there are more of them in more parts of America than you might think. Here’s a rundown of where they are.

The United States Geological Survey counts 169 potentially active volcanoes in the country — some of them straight-from-the-textbook conical mountains topped with craters, and others that hardly look the part at all. About 50 of them in six states are rated high priority or highest priority for monitoring. A few have been active in modern times; others last erupted hundreds or even thousands of years ago.

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