Many rivers make up pieces between the US-Canadian border
Detroit River, Halls Stream: New Hampshire - Quebec, Monument Creek, Niagara River, Pigeon River: Minnesota - Ontario, Rainy River: Minnesota - Ontario, St. Clair River: Michigan - Ontario, St. Croix River: Maine - New Brunswick, St. Francis River Maine - Quebec, St. John River: Maine - New Brunswick, St. Lawrence River, St. Marys River
The river that makes up part of the U.S. Canadian border is the St. Lawrence River.
