or Zurich City (pop., 2000: city, 363,273; 1998 est.: metro. area, 935,118), Switzerland. Located at the northwestern end of Lake Zürich, the site was occupied first by prehistoric lake dwellers and later by the Celtic Helvetii before the Romans conquered the area 58 BC. It subsequently was held by the Alamanni and the Franks. Zürich grew as a trade centre, and in 1218 it became a free imperial city. In 1351 it joined the Swiss Confederation. Under the leadership of Huldrych Zwingli, Zürich became the centre of the Swiss Reformation in the 16th century. Attracting refugees from the Counter-Reformation, it established a liberal democratic order during the 1830s. Long an industrial centre and Switzerland's largest city, Zürich is also an important financial centre and a major tourist destination. The city's cultural treasures include the National Museum (1833) and the Zürich Opera (1891)
German Zürichsee Lake, north-central Switzerland. Extending southeast from the city of Zürich, it lies at an altitude of 1,332 ft (406 m) and has an area of about 34 sq mi (88 sq km). It is 18 mi (29 km) long and has a maximum depth of 469 ft (143 m). The Linth River flows into it and emerges as the Limmat