The western states in the 48 contiguous states that have the longest border with Canada are Washington and Montana. Washington shares a border with British Columbia, while Montana shares a border with Alberta, Saskatchewan, and British Columbia.
Montana
In the west, the state of Montana has the longest linear border with Canada. In the east, the state of Michigan has the longest border, including the Great Lakes.
At 8891 km, the border between Canada and the USA is the longest between any two countries, but a major section of that border (with Alaska) is not contiguous with the rest. The longest contiguous section of border between two countries in the world is between Russia and Kazakhstan, at 6846 km.
Montana
Montana
49o N is the latitude separating the four western provinces of Canada from the US states to their south. ========================================================================= The International Border between Canada and the US includes portions of both the 49th parallel and the 45th parallel.
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Montana
Montana does.
North of the Equator and in the Western Hemisphere of the world.
the Mackenzie River