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Lassen Peak, one of the worlds largest plug dome volcanoes, last erupted in May, 1914.  Called a miniature Yellowstone by many, mud pots, fumaroles and boiling water continue to this day.  Lassen is part of the Pacific Ring of Fire.  This view of volcanic venting is from the Bumpass Hell trail.
091509Bumpass Hell, Lassen Volcanic National Park1458Douglas Orton.jpg