The Restigouche River () is a river that flows across the northwestern part of the province of New Brunswick and the southeastern part of Quebec. The river flows in a northeasterly direction from its source in the Appalachian Mountains of northwestern New Brunswick to Chaleur Bay. Its meander length is approximately . The Restigouche is fed by several tributaries flowing south from Quebec's Notre Dame Mountains on the western edge of the Gaspé Peninsula (Kedgwick River, Gounamitz River, Patapédia River, and Matapedia River) as well as the Upsalquitch River flowing north from New Brunswick's Chaleur Uplands. Located mostly in New Brunswick, the river forms the inter-provincial boundary between the two provinces from its confluence with the Patapédia River to its mouth at Dalhousie, New Brunswick and Miguasha, Quebec where it discharges into Chaleur Bay. The estuary is in length, extending from the river's discharge point at Dalhousie in the east to Tide Head, New Brunswick in the west and is an important stopover for sea ducks, especially black scoters and surf scoters, during migration. This estuary has been designated an Important Bird Area by the Canadian Wildlife Service. The Royal Canadian Navy has named two warships after this river: and . The source of Restigouche River is located at the confluence of the Little Main Restigouche River and Kedgwick River. This confluence is located: West of the village center of Kedgwick, New Brunswick; South of the confluence of the Patapédia River, which is located at the border between Quebec and New Brunswick; Southwest of Campbellton, New Brunswick, crossing the Restigouche River. From the confluence of the Little Main Restigouche River and Kedgwick River (in New Brunswick), the Restigouche river flows on up to the confluence, distributed according to the following segments: Higher Courses of the Restigouche River (upstream of the Kedgwick River)(segment of ) to the Northeast, forming a curve to the Northwest, to the Soldiers Creek (from the east); North, in a curve to the East, until UpperDowns Gulch (from the southwest); to the Northeast, to Tracy Brook (from the West); to the Southeast until Haffords Brook (from the South); Eastward, forming a curve oriented toward the southeast until Stillwater Brook (from the east); North, to the confluence of the Patapedia River (from the West) which forms the boundary between the Quebec and New Brunswick. Middle course of the river (upstream of the Patapédia River) (segment of ) From