8 Mile Corner is a survey marker in the Cimarron National Grassland that marks the tri-point (a place where three states meet) of Kansas, Colorado, and Oklahoma.
[5] The corner monument is below grade of east-west State Line Road in the westbound lane, hidden by a steel cover.
[5] A few feet below the closed manhole is the Department of the Interior cadastral survey disk set in concrete, part of the Federal Base Network.
[2] The site is approximately 8 miles (13 km) west of Elkhart, Kansas on mostly-unpaved State Line Road[3] at an elevation of 3,689.6 feet (1,124.6 meters).
[9] The view around this site has been described as "starkly beautiful", with yucca blooms in the spring and buffalo gourd in the summer as the most notable flora.