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 St. Lawrence River.
St. Lawrence
New york
lake erie
The Saint Lawrence forms part of the eastern border between the United States and Canada. Other rivers that form the border include Rainy River, Pigeon River, and Niagara River.
The Snake River forms part of Oregon's eastern border
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.
The Yukon River crosses the Canada-US border, but does not form part of it.
The river which forms part of the border between the Rocky Mountains and the Pacific Ocean is the Columbia River.
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.
The Red River.