Tri-State Marker
A native stone marker that marks the tri-point at the southeast corner of Kansas, northeast corner of Oklahoma, and western edge of Missouri. It is also called "SE Corner Monument" in Kansas.
More recent surveys have shown the actual tri-point is about 50 feet (15 m) to the southeast where a new marker was placed by the Missouri Department of Natural Resources.
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The original tri-state marker
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The new tri-state marker