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The border between New York State, USA and Ontario, Canada is formed entirely by waterways. Lake Ontario is the longest stretch of the border.

The rivers which form the rest of the border are the Niagara River, which flows from Lake Erie into Lake Ontario, and the Saint Lawrence River, which flows from Lake Ontario out to the Gulf of Saint Lawrence and the Atlantic Ocean.

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12y ago
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Q: What river borders New York and Canada?
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