Boundary Monument 1 (East), Maine

This is the easternmost border monument on the international boundary with Canada. East of this point, the international boundary with Canada is over water, all the way to the Atlantic Ocean. This point, defined by treaty, is where the headwaters of the St. Croix River meets the North Line, where the border heads due north for 78 miles, until it hits the St. John River. Monument 1 is a tall stone obelisk, installed in this swamp in 1843. It is one of only five such monumental monuments on the border. There is another at the west end of the boundary, on a bluff overlooking the Pacific Ocean, 3,500 miles down the line.