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Mount Saint Helens
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Mount Saint Helens Map of Washington state highlighting the location of Mount St. Helens in the southwestern part of the state, near the border with Oregon. The map includes surrounding states and Canada, with a small inset globe showing the region's position in North America.
Large plume of dark gray volcanic ash and smoke billowing from Mount Saint Helens during an eruption, with a dark tree-lined ridge in the foreground.
Mount Saint Helens Mount Saint Helens
Watch the volcanic eruption of Mount Saint Helens and subsequent flooding caused by melted glaciers
Mount Saint Helens
Magma streaming down a volcano.
Figure 2: The north face of Mt. St. Helens in June 1970. The summit elevation was 2,950 metres. Mount St. Helens volcano
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Mount Saint Helens
Mount Saint Helens Eruption of Mount Saint Helens on May 18, 1980.

Mount Saint Helens

mountain, Washington, United States
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

Mount Saint Helens, volcanic peak in the Cascade Range, southwestern Washington, U.S. Its eruption on May 18, 1980, was one of the greatest volcanic explosions ever recorded in North America. Mount Saint Helens was named by English navigator George Vancouver for the British ambassador to Spain, Alleyne Fitzherbert, who held the title of Baron St. Helens. The volcano’s eruptive history is thought to extend back 300,000 years, with eruptive periods characterized by a succession of...

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