The rivers themselves do not form the border. Rather, the border runs through the rivers. Generally speaking, the border follows the centre of the main channel of the river.
Both the St Lawrence River and the Niagara River qualify.
The border between Canada and the US runs through the St Lawrence River from Lake Ontario to the 45th parallel.
The St Lawrence River at one point and the Niagara River at another.
The St. Lawrence River
The St. Lawrence River.
The St.Lawrence
Saint Lawrence River
The St Lawrence and the Niagara
the river that forms the border between south america and zimbabwe is Limpopo.
the river that forms the border between India and Kentucky is the Mississippi River.
New York to the north east, Ohio to the south west
The TAKUKU river forms a border between the Rupununi savannahs in Guyana and Bom Fin in Brazil - thus between Guyana and Brazil.
The 49th parallel of latitude forms the border between Canada and the US from Lake of the Woods to the Georgia Strait. The 45th parallel of latitude also forms part of the border between Canada and the US along the northern boundaries of the states of New York, Vermont and New Hampshire.
Saint Lawrence River
the river that forms the border between south america and zimbabwe is Limpopo.
the Niagara river.
New york
The St. Laurence river separates Ontario & Quebec .
the Niagara river.
the Niagara river.
the Niagara river.
The St. Lawrence River
The Niagara River flows north from Lake Erie to Lake Ontario. It forms part of the border between the Province of Ontario in Canada and New York State in the United States.
The Orinoco River forms a 200-mile border between Venezuela and Colombia in South America.
The Limpopo forms that border between Zimbabwe and South Africa.