The Potomac River
Georgia's southwestern border is formed by the Chattahoochee River.
The Mekong River forms a border between Thailand and Laos.
The Rio Grande forms part of the US border with Mexico, while the St. Lawrence River forms part of the border between the US and Canada.
The Danube River and the Rhine River form the border of much of the northeastern part of the Roman Empire. These rivers provided natural barriers that helped protect the Empire from invasions from various tribes and armies.
The Limpopo forms that border between Zimbabwe and South Africa.
The Missouri River
The St. Lawrence River.
The Mighty Mo or the Missouri River.
The Potomac River divides Maryland and Virginia (The Southern Border) , but Virginia does not own half of the Potomac River.
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The Aquidaban River is a river in northeastern Paraguay. The Apa River forms part of the border between Paraguay and Brazil. The Acaray River in eastern Paraguay.
The Ohio River forms the borders of West Virginia, Ohio, Kentucky, Indiana, and Illinois. The border terminates at the confluence with the Mississippi and the border with Pennsylvania.
The Mississippi River runs along the northeastern border of Dakota County, Minnesota.
The Potomac River separates Maryland and Virginia.
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the st. Marys river
West Virginia, Ohio, Illinois, and Indiana form the northern border of Kentucky, along the Ohio River.