Mount Thielsen, Extinct stratovolcano in southern Oregon, United States.
Mount Thielsen rises to 9,182 feet with a sharp spire-shaped peak formed through extensive glacial erosion of its volcanic structure.
The volcanic activity of Mount Thielsen ceased approximately 250,000 years ago, following a series of eruptions that deposited basaltic andesite layers.
The Klamath Native Americans named this mountain hisc'akwaleeʔas, while early explorers dedicated it to railroad engineer Hans Thielsen.
The Mount Thielsen Wilderness provides 55,100 acres of recreational space with access to the Pacific Crest National Scenic Trail and multiple hiking paths.
The summit frequently attracts lightning strikes that create fulgurite, a glass-like mineral formation produced when electricity melts the rock surface.
Location: Douglas County
Elevation above the sea: 2,799 m
GPS coordinates: 43.15287,-122.06656
Latest update: May 18, 2025 17:05
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