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Lassen Volcanic National Park, geologically active area in northern California, U.S., about 50 miles (80 km) east of Redding. The park contains Lassen Peak, which reaches an elevation of 10,457 feet (3,187 metres); it and Mount Saint Helens, some 400 miles (640 km) to the north in Washington state, were the only active volcanoes in the 48 conterminous U.S. states during the 20th century. Lassen Peak and Cinder Cone to the northeast of it were...