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Between Canada and the US.
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An open border is one that allows unrestricted entry and exit. The border between Canada and the US has been described as the world's longest "undefended" border, but it is not an "open" border. Even the "undefended" concept of the Canada-US border is now being questioned.
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Does Tennessee border the worlds longest river?
The Amazon River in South America is the longest river in the world. Tennessee does not border it.
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Canada has the longest border in the world, measuring about 8,891 kilometers (5,525 miles) long, shared with the United States.
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California has the longest border with Nevada.
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