 The portion that forms the boundary starts at the bottom of Lake Pohenegamook at the very northernmost point of New England between Estcourt Station, Maine, and Estcourt, Quebec.The river along the international boundary flows south and then south-east through two deep, narrow lakes to its mouth on the Saint John River at St. Francis, Maine/Saint-François-de-Madawaska, New Brunswick.USS "Bancroft" (DD-256) became a Canadian ship as part of the Destroyers for Bases Agreement and was renamed after the St. Francis River to follow the Canadian tradition of naming destroyers after Canadian rivers while recognizing the shared national history of the ship.