Page "Webster–Ashburton Treaty" Paragraph 10

Another clarification made in this treaty resulted in cementing the anomaly of the Northwest Angle.

Again, due to errors on the Mitchell Map, Treaty of Paris reads "... through the Lake of the Woods to the most northwesternmost point thereof, and from thence on a due west course to the river Mississippi ..." With the border clarification established by the Anglo-American Convention of 1818 defining the boundary about Lake of the Woods to the Rocky Mountains, this treaty reaffirmed the border and further detailed the border by modifying the border definition to instead read as "... at the Chaudiere Falls, from which the Commissioners traced the line to the most northwestern point of the Lake of the Woods, thence, along the said line to the said most northwestern point, being in latitude 49 ° 23 ′ 55 ″ north, and in longitude 95 ° 14 ′ 38 ″ west from the Observatory at Greenwich ; thence, according to existing treaties, due south to its intersection with the 49th parallel of north latitude, and along that parallel to the Rocky Mountains ..."