Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range, and is the second highest mountain in Oregon. It is situated in the far northeastern corner of Linn County on the Jefferson County line, with the lower reaches extending northward into southeastern Marion County. The mountain, about 105 miles (169 km) east of Corvallis, is federally protected as part of the Mount Jefferson Wilderness. Due to the rugged area, the mountain is one of the hardest volcanoes to reach in the Cascades, though USFS Road 2243 does come within 4 miles (6.4 km) of the summit. Jefferson's craggy and very glacially scarred appearance makes it especially photogenic.