Yamsay Mountain is a huge, sprawling (and fortunately now dormant) shield volcano with a glacier-carved crater on its northeast side. It sits 35 miles due east of Crater Lake National Park, at the border of Klamath and Lake Counties. Yet, despite its height and size (it covers 75 square miles), Yamsay is barely visible above the surrounding hills and forests. What makes it interesting as a hike is its size: it’s #73 on the list of Oregon’s highest peaks, #15 of the peaks that share a history of Cascade Range volcanism, and #14 on the list of Oregon’s most prominent peaks (where prominence is the elevation of a summit relative to the surrounding terrain). All this listing makes the peak attractive to peakbaggers and view-obsessed hikers (like us). It’s also a popular winter cross-country ski route. And the recent placement of a geocache near the summit has attracted yet another group of visitors (Yamsay geocache). So it’s a bit obscure but not unpopular.