The Cimarron meridian is a survey line in the United States at longitude 103° west from Greenwich.
[1] The initial point for the Cimarron meridian is confused with the marker known as Texhomex, which was placed during a resurvey.
The Cimarron meridian initial point marker establishes the place where the 103° west meridian intersects the baseline from whence land in the Oklahoma Panhandle (formerly No Man's Land) is surveyed.
The initial point is about 2 miles east of the northwest corner of Texas, both of which were surveyed to lie on the 103° west meridian in the 19th century before longitudinal accuracy was assured.
The northern end of the meridian was established for the northwestern point of Oklahoma.