Saint John, city in southern New Brunswick, Canada, seat of Saint John County. It is on the Bay of Fundy at the mouth of the Saint John River. The largest city in the province, it is a commercial and manufacturing center, a major year-round seaport, and a rail terminus. Products include refined petroleum, wood and paper items, beverages, and processed food. Tourism and building and repairing ships are important to the city's economic base. An increasing segment of the city's population works in service-based sectors such as information technology. Saint John Airport is located in the city.
A campus of the University of New Brunswick is located in the city. Saint John is the site of Martello Tower, a harbor fortification built during the War of 1812; the Aitken Bicentennial Exhibition Centre, which contains several galleries; and the New Brunswick Museum, which is Canada's oldest museum and houses historic collections. Saint John is also home to the Reversing Falls of the Saint John River, the result of a reversal of the river flow caused by tides of the Bay of Fundy. Rockwood Park, a recreational area containing the Cherry Brook Zoo, is the site of the annual Loyalist Days celebration in July. Other annual events include the Festival by the Sea, held in August.