People always think Canada has only one international border: with the US. But in reality, Saint Pierre et Miquelon is so close to Newfoundland that there is no international water between them. So in addition to our land and maritime borders with the US, we have a maritime border with France. Also one with Greenland (Denmark), but that's too arctic for anyone to care about.
When Prohibition was active in both the US and Canada, St. Pierre & Miquelon was the place buy smuggle booze into Canada (and the USA).
In recent times, it was the source of tax-free, cheap Canadian cigarettes and Canadian booze. Neither of which the local French population consume, but are more than happy to sell it to Newfoundlanders visiting :-)