Which rivers share a border with the U.S. and Canada?

Answer 1

21

Answer 2

I am most definitely sure that the Yukon River, the Columbia River, and the St. Lawrence River are the three rivers that share a border with Canada and the United States. This question is missed a lot because people forget about the Yukon River in Alaska.

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First, although borders often run lengthwise through rivers, rivers do not "share" borders. Countries can share a border with each other, and so can provinces and states, but not rivers.

Second, the Columbia River and the Yukon River cross the International Boundary, but the boundary does not run lengthwise through those rivers.

Rivers through which the International Boundary runs lengthwise include Rainy River, Pigeon River, St Marys River, St Clair River, Detroit River, Niagara River, and (in part) St Lawrence River.