Mount Sylvania is an extinct

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are ...

, part of the

Boring Lava Field The Boring Lava Field (also known as the Boring Volcanic Field) is a Plio-Pleistocene volcanic field with cinder cones, small shield volcanoes, and lava flows in the northern Willamette Valley of the U.S. state of Oregon and adjacent southwest ...

, on the outskirts of

Portland, Oregon Portland (, ) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous co ...

. Parts of the mountain are within the cities of Portland,

Lake Oswego Lake Oswego () is a city in the U.S. state of Oregon, primarily in Clackamas County, with small portions extending into neighboring Multnomah and Washington counties. Located about south of Portland and surrounding the Oswego Lake, the town w ...

, and Tigard. The Sylvania campus of

Portland Community College Portland Community College (PCC) is a public community college in Portland, Oregon. It is the largest post-secondary institution in the state and serves residents in the five-county area of Multnomah, Washington, Yamhill, Clackamas, and Colu ...

is located on the mountain's western slopes.

References

External links

* Volcanoes of Oregon Mountains of Oregon Subduction volcanoes Cascade Volcanoes Volcanoes of Multnomah County, Oregon Volcanoes of Clackamas County, Oregon Lake Oswego, Oregon Shield volcanoes of the United States Mountains of Clackamas County, Oregon Landforms of Multnomah County, Oregon {{MultnomahCountyOR-geo-stub