Yamsay Mountain, Fremont–Winema National Forest

Yamsay Mountain is a large shield volcano in the Cascade Range of south-central Oregon, located about 35 miles east of Crater Lake on the border between Klamath County and Lake County. It is part of the Cascade Volcanic Arc but is located in a mountain range 30 to 50 miles behind the main Cascade volcanic front. The best known members of this enigmatic arc are the massive shields of Newberry Volcano, about 55 miles farther north in Oregon, and Medicine Lake Volcano, about 80 miles south in Northern California. Yamsay is the highest volcano in the eastern arc, almost 300 feet higher than Newberry and Medicine Lake. ()