The Pembina River is a tributary of the Red River of the North, approximately 319 miles (513 km) long,[1] in southern Manitoba in Canada and northeastern North Dakota in the United States. It drains an area (about 8500 square kilometers) of the prairie country along the U.S.-Canada border, threading the Manitoba-North Dakota border eastward to the Red River. Via the Red River, Lake Winnipeg and the Nelson River, it is part of the watershed of Hudson Bay.
It rises in several streams on the eastern side of the Turtle Mountains on both sides of the international border. The streams converge near Neelin, Manitoba and flow initially northeast, then southeast along the west side of the Pembina Hills into Cavalier County in northeastern North Dakota. It flows east, just south of the border, past Walhalla and Neche. It joins the Red River from the east at Pembina, approximately 2 miles (3 km) south of the international border. It receives the Tongue River from the south approximately 2 miles (3 km) upstream from its mouth on the Red.