Earlier quoted context omitted.
Might be less surprising once you hear what Canadians mean when they say "Eastern Canada". Canada's divided almost exactly in half with the top half (48% of the land area) being the territories (Yukon, Northwest Territory, Nunavut; collectively "Northern Canada") and the bottom half being the provinces. When people say "Eastern Canada", they're referring to the Eastern provinces (Ontario, Quebec, the maritimes), and…
the US, Denmark and France?
After a long, protracted dispute with Denmark where we sent our respective militaries out to Hans Island to give each other gifts of Whiskey and Schnapps (known as "The Whisky War"), we finally settled on drawing a border down the middle of the island giving Canada and Greenland/Denmark a land border.
Canada shares a maritime border with France at St Pierre and Miquelon, a few islands off the coast of Newfoundland that are a French overseas territory.