Saint John River (Bay of Fundy) Saint John River (Bay of Fundy) The Saint John River (; Maliseet: "Wolastoq") is a river, approximately long, located principally in the Canadian province of New Brunswick, but also in and arising from three primary sources in the province of Quebec and the U.S. state of Maine. It forms part of the Canada–United States border in two different stretches along its length. The river drains an area of approximately , of which slightly more than half is located in New Brunswick. Along that portion of the Atlantic shoreline of North America that lies between the St. Lawrence River and the
Bay of Fundy throughout the tidal range of the rivers. Another phenomenon which occurs in these rivers of the upper bay is a "tidal bore", where a wave front of water "bores" its way up a river against its normal flow. The narrow and shallow river estuaries around the upper Bay of Fundy regularly produce bores when the advancing tide is slowed by shallow waters creating a build-up with a steep surge of advancing water. Tidal bores are found on the Salmon River at Truro, the Petitcodiac River at Moncton as well as on the Shubenacadie River, the St. Croix River, the Maccan