america
colroado river
The Colorado River.
The Mississippi River forms the western boundary of the State of Illinois.
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 boundary of Tennessee.
The Atlantic Ocean.
Mississippi river
The Pacific Ocean
black sea
mississippi river
Missisippi
The Mississippi River forms the western border of Illinois.