Saint John is located 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. A 2006 real estate survey has estimated the population of Saint John, New Brunswick at 122,389.