8 Mile Corner is a survey marker in the Cimarron National Grassland that marks the tri-point of Kansas, Colorado, and Oklahoma. This point is also the meeting point for three distinct regions of America – the Western United States (Colorado), the Midwestern United States (Kansas), and the Southern United States (Oklahoma). An old mock weather vane stood nearby as a landmark, emblazoned with the abbreviations for the three states pointing in the direction of each respective state. The weather vane was reported to have been destroyed between 2011 and 2019. The old monument, locally referred to as a "windmill," was built in 1903.