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.
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Montana
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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.
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The Pacific Ocean
No, Ontario has the longest border with Canada and the US.
Contiguous is an adjective describing things that share a common border, are touching, or things together in a sequence. Example: The United States and Canada share a contiguous border.