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Ontario with a 2,760 km (1,715 mi) border, followed by BC 2,168 km (1,347 mi).

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12y ago
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10y ago

The US does not have provinces. The state of Alaska has the longest border with Canada.

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12y ago

british colimbia

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13y ago

Ontario

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Q: What Canadian province has the longest border along the International Boundary?
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