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At Cairo, Illinois, the Ohio joins the Mississippi. The three states that have borders there are Illinois (to the NE), Kentucky (to the SE) and Missouri (to the W).
The Missouri river joins the Mississippi at St. Louis.
Missouri, Illinois, and Kentucky.
Missouri, Kentucky, and Illinois
Lake Erie
Kentucky, Indiana, Illinois
The Missouri River joins the Mississippi very near St Louis.
Mississippi River
The confluence of the Ohio and Mississippi is essentially the Missouri-Illinois-Kentucky "triple point".
The Missouri joins the Mississippi near St. Louis, Missouri.
Indiana, Ohio, and Illinois
missouri