The area between the Mississippi River and the Rockies is known as the Great Plains.
Missouri river
The Mississippi River forms the boundary between Illinois and Missorui
The Mississippi River
The Saint Croix and Mississippi Rivers form part of the boundary between Wisconsin and Minnesota.
The Great Plains is the huge expanse of flatlands from the Rocky Mountains eastward to the Mississippi River.
The great plains!
Interior Plains
The Mississippi River.
Memphis, TN is located along the Mississippi River.
The Mississippi River.
Mississippi