Canada is part of North America. Niagara Falls is part of the border between Canada and the US.
The Yukon River crosses the Canada-US border, but does not form part of it.
Canada is on the north in relation to the US. The southern part of Canada forms the border with the northern part of United States.
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.
Canada or Mexico
The US-Canada border is the longest border in the world. It stretches for 8,891 km.
The Great Lakes
Niagra Falls
The St. Lawrence River.
Great Lakes
No, it does not. The only two countries the US has a physical border with are Canada and Mexico and both are considered part of North America.
No, Ontario has the longest border with Canada and the US.