The Oregon Skyline Trail is a long-distance trail in the Cascade Mountains of Oregon. The trail extends from Cascade Locks on the Columbia River south to Siskiyou Summit near the Oregon-California border. The century-old trail is a foot and equestrian path that passes through nine wilderness areas, Crater Lake National Park, and Cascade-Siskiyou National Monument. Historically known as the Oregon Skyline Trail or Skyline Trail, the entire length of the trail was incorporated into the Pacific Crest National Scenic Trail in 1968.