Machias Seal Island: the remote territory facing the U.S. and Canada for centuries

The border between the United States and Canada is the longest in the world, with an extension of about 8,900 kilometres.This dividing line, which largely follows the 49th parallel, crosses dense forests, lakes and mountains.Unlike the boundary separating the United States from its southern neighbour, most of it does not have fences or physical barriers that delimit it.At the eastern end of this border, where the Gulf of Maine is located with Fu…