There was a boundary dispute over the border with Wisconsin. The northwesternmost portion of the border follows a line from Lac Vieux Desert to the headwaters of the Montreal River. An 1847 survey established the east branch of the Montreal River as the border. However, the 1908 revision of the Constitution of Michigan specified that the west branch of the Montreal River was the proper border, which would have placed at additional 360 square miles of land on the Michigan side of the border. A 1926 Supreme Court decision awarded this tract of land to Wisconsin.