The Mighty Mo or the Missouri River.
The Missouri River forms the border between Iowa and Nebraska.
The Missouri River and its tributary, the Big Sioux, form the western border of Iowa.
The Mississippi River forms the Western border of the States of Illinois, Tennessee, and Mississippi. The Mississippi River forms the Eastern border of the States of Iowa, Missouri, Arkansas, and Louisiana.
The Mississippi River forms the western border of Illinois.
Madison, Gallatin, Yellowstone, Little Missouri, Cheyenne, White, Niobrara, Platte, Kansas, Osage, Gasconade Jefferson, Sun, Marias, Milk, James, Big Sioux, Grand, Chariton
the northeast border of Texas is the red river
The two rivers that form the northern border of North Korea are the Yalu River and the Tumen River.
Mississippi
The Mississippi River forms the eatern border. The St. Frances River form a small part of the border on the northeast. The Red River forms a small part of the southwestern border.
Mississipi-Missouri
the Rhine river