Mount Sylvania, Shield volcano summit in Southwest Portland, Oregon.
Mount Sylvania rises to an elevation of 978 feet with a prominence of 510 feet, offering views across the Tualatin Valley and West Hills.
The extinct volcano formed over a million years ago as part of the Boring Lava Field, alongside Highland Butte and Larch Mountain in the region.
The name Sylvania comes from Silvanus, while Nansen Summit Park at the peak honors Norwegian polar explorer and Nobel Peace Prize recipient Fridtjof Nansen.
The summit area includes a weather station, radio telemetry antenna, and benches, with access restricted between 10:00 p.m. and 6:00 a.m.
Portland Community College established its Sylvania campus on the western slopes, making it the only mountain in Portland supporting a major educational institution.
Location: Oregon
GPS coordinates: 45.43816,-122.72211
Latest update: March 19, 2025 15:46
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