Mount St. Helens

Mount St. Helens is an active stratovolcano in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of  Seattle and 53 miles (85 km) northeast of  Portland, Oregon. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who made a survey of the area in the late 18th century. The mountain is in the Cascade Range and is part the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.
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Noun
1. an active volcano in the Cascade Range in southwestern Washington; erupted violently in 1980 after 123 years of inactivity
(synonym) Mount Saint Helens, Mt. St. Helens
(hypernym) volcano
(part-holonym) Cascades, Cascade Range, Cascade Mountains