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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:
Geode State Park has been a traditional favorite for locals as well as out-of-state visitors. The park is named after the state rock which is frequently found in the area. Geodes bring rock hounds to the local area in search of this elusive prize. A display of geodes, with mysterious crystal formations in their hollow cavities, can be seen at the park office.