OKARMO Corner, monument showing the tripoint of Oklahoma, Arkansas and Missouri
OKARMO Corner is a monument near Southwest City, Missouri, marking where the borders of Arkansas, Oklahoma, and Missouri meet. The site consists of stacked stones added over time: an original boundary stone from the 1820s at the top, a marble pedestal added in 1915, and a concrete circle with carved lines at the base.
The original boundary stone dates to the 1820s and marked the Arkansas-Missouri border following the Missouri Compromise of 1820. In 1915, the Ozark Culture Club built a marble pedestal to protect the aged stone and inscribed it with the years each state joined the Union.
The name OKARMO combines the initials of the three states: Oklahoma, Arkansas, and Missouri. Visitors can stand at one spot and experience being in three states simultaneously, creating a direct connection to how state boundaries shape the land.
The monument sits along Missouri Route 43, about one mile south of Southwest City, and is free to visit year-round. Visitors can park at paved road shoulders and should watch for traffic when crossing the road and exploring the area.
A local farmer rediscovered the lost boundary stone from the 1820s and brought it to community attention, leading to its preservation and protection. This recovered stone now crowns the monument and links early land survey history with grassroots efforts to preserve it.
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