Missouri is landlocked and borders eight different states, a figure equaled only by its neighbor, Tennessee. Missouri is bounded by Iowa on the north; by Illinois, Kentucky, and Tennessee across the Mississippi River on the east; on the south by Arkansas; and by Oklahoma, Kansas, and Nebraska (the last across the Missouri River) on the west. Whereas the northern and southern boundaries are straight lines, the Missouri Bootheel extends south between the St. Francis and the Mississippi rivers. The two largest rivers are the Mississippi (which defines the eastern boundary of the state) and the Missouri River (which flows from west to east through the state), essentially connecting the two largest metros of Kansas City and St. Louis.