The answer is tennesee
Missouri, Illinois, and Kentucky.
Lake Erie
Kentucky, Indiana, Illinois
When the Ohio River joins the Mississippi River, the three states that come together are Illinois, Kentucky, and Missouri. The confluence of these rivers serves as a natural boundary between these states. This area is significant both geographically and historically, as it has been a vital waterway for transportation and trade.
Indiana, Ohio, and Illinois
The Mississippi River flows through Louisiana, and empties into the Gulf of Mexico. The Gulf of Mexico joins the Atlantic Ocean at Floridas eastern coast.
The confluence of the Ohio and Mississippi is essentially the Missouri-Illinois-Kentucky "triple point".
Missouri, Kentucky, and Illinois
Missouri, Illinois, and KentuckyIllinois, Missouri, Kentuckey
The Benue River joins into the Niger River -Jose(ph)
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).