Ring of Fire Lassen Peak

Before the 1980 eruption of Mount Saint Helens in Washington, Lassen Peak was the most recent volcanic outburst in the contiguous 48 states. The peak is the southernmost volcano in the Cascade Range, which extends from here into Canada. Lassen Peak is but one of the active, dormant, or extinct volcanoes that extend around the Pacific Ocean in a great "Ring of Fire".