Gdańsk, Poland, one of the nation's largest cities and the capital of Pomorskie province. It lies near the mouth of the Vistula River on the Gulf of Gdańsk, an arm of the Baltic Sea. Gdańsk's port and that of nearby Gdynia together handle most of Poland's shipping. Shipbuilding was the city's main economic activity until 1997, when the shipyards closed. The chief economic activities today are petroleum refining, food processing, and manufacturing. Institutions of higher learning include a university and a polytechnic institution. The Church of St. Mary's, which dates from the 14th century, is a notable landmark.