Boundary Waters Treaty of 1909

The Boundary Waters Treaty is the 1909 treaty between the United States, and Great Britain with respect to the Dominion of Canada, providing mechanisms for resolving any disputes over waters bordering the U.S. and Canada. The treaty covers the

Main shore to main shore of the lakes and rivers and connecting waterways, or the portions thereof, along which the international boundary between the United States and the Dominion of Canada passes, including all bays, arms, and inlets thereof, but not including tributary waters which in their natural channels would flow into such lakes, rivers, and waterways, or waters flowing from such lakes, rivers, and waterways,or canals or streams, or steams or the waters of rivers flowing across the boundary.

Canada, as a dominion of the Crown of Britain at the time, subsequently enacted the International Boundary Waters Treaty Act to implement the treaty.