Mink Lake is the second-largest wilderness lake in the US state of Oregon. Mink Lake lies at about 5,000 feet (1,500 m) above sea level on a Cascade Range lava plateau in the Three Sisters Wilderness in eastern Lane County. One of many lakes in the Mink Lake Basin, it covers 139 acres (56 ha). Hiking trails enter the Mink Lake Basin, at the headwaters of the South Fork McKenzie River, from many directions. The Pacific Crest Trail runs roughly north–south about 1 mile (1.6 km) east of the lake. Natural campsites abound in the area, but in warm weather mosquitoes can be a problem.