colroado river
The Mississippi River forms the western boundary of the State of Illinois.
The Colorado River.
Mississippi river
The Mississippi River forms the western boundary of Tennessee.
mississippi river
The Potomac River forms most of Maryland's western boundary.
The Ohio River forms the western boundary of West Virginia.
The Mississippi River forms the western boundary of Illinois.
The river Shannon forms much of the eastern boundary and the River Suck forms much of the western boundary. They are the two major rivers in Roscommon.
Missisippi
The physical feature that forms Uruguay's western boundary with Argentina is the Uruguay River. It also forms part of the Brazilian-Argentine border.
The Mississippi River forms the western border of Illinois.