Is Alaska's Border Precisely Defined?

Yes. The Alaska–Canada border is one of the most precisely surveyed and legally settled international boundaries in the world.

• 1825 Treaty of St. Petersburg (Anglo-Russian Convention): Defined the 141st Meridian (north–south) and the Portland Canal / mountain crest line (panhandle).
• 1903 Alaska Boundary Tribunal: Resolved the panhandle dispute (6–3 vote favoring US interpretation).
• 1904–1920s: Joint US–Canada field surveys monumented the entire 1,538-mile (2,475 km) border with thousands of markers.
• Modern Maintenance: International Boundary Commission (IBC) inspects and restores monuments regularly; GPS/GNSS confirms coordinates to centimeter accuracy.

No active disputes exist. The border is a model of peaceful, technical demarcation.