Michigan Compiled Laws, Chapter 2. State § 2.202

Sec. 2.  That the western boundary of the state of Michigan in the waters of lake Superior and the eastern boundary in the waters of lake Superior of the states of Minnesota and Wisconsin be and it hereby is finally fixed and established as the line marked M-N on the map, which line is more particularly described as follows:

Starting at Point M, the point where the line through the middle of the main channel of the Montreal river enters lake Superior;

Thence in a direct line to Point N, the point where a line drawn through the most easterly point of Pigeon Point and the most southerly point of Pine Point intersects the international boundary, on a true azimuth of 23°27′24″, a distance of 108.86 statute miles.

The latitude and longitude of the named control points is: