Saint John (river, Maine and New Brunswick)

Saint John (river, Maine and New Brunswick), river, east central North America. A total of 670 km (420 mi) long, the river rises in northwestern Maine and flows northeast to the New Brunswick line, at Saint Francis. It then forms part of the U.S.-Canada boundary before entering New Brunswick and flowing southeast past Fredericton, to the city of Saint John, where it empties into the Bay of Fundy. In New Brunswick the river drives several large hydroelectric plants and drains productive farming regions. The great surge of Fundy at high tide creates the Reversing Falls on the river near Saint John.