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About Keokuk Geodes. Keokuk Geodes. Keokuk, Iowa is situated at the confluence of the Mississippi and Des Moines Rivers in the extreme southeastern portion of the state of Iowa. Illinois borders Iowa on the east and Missouri is to the south (area known locally as the Tri-State area). See map below for a visual view:
Meadeâs Ranch in Osborne County, Kansas, is the Geodetic Center of North Americaâthe point of reference by which all property lines and boundaries in North America are surveyed. Identified in 1901, this triangulation station for the United States, Canada and Mexico is also known as the North American Datum.