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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:
The Missouri River and its tributary, the Big Sioux, form the western border, making Iowa the only U.S. state that has two parallel rivers defining its borders. Iowa is bounded by the states of Minnesota to the north, Wisconsin and Illinois to the east, Missouri to the south, and Nebraska and South Dakota to the west. Des Moines, in the south-central part of the state, is the capital. The state name is derived from the Iowa Native American people who once inhabited the area.