Today, most of Yellowstone is in Wyoming, with about 3% covering part of Montana and about 1% within Idaho's borders. And in true Idaho fashion, this section just happens to be the part of ...

Though the volcano’s magma chambers could hold enough material for a caldera-forming event, none of them are likely to erupt ...

Yellowstone National Park's nearly 3,500 square miles seep slightly across state borders into Montana and Idaho, but its major attractions are contained in the northwest corner of Wyoming.