Hamburg, officially the Free and Hanseatic City of Hamburg (German: Freie und Hansestadt Hamburg; Low German: Friee un Hansestadt Hamborg), is the second-largest city in Germany after Berlin, as well as the overall 8th-largest city and largest non-capital city within the European Union with a population of over 1.9 million. Hamburg's urban area has a population of around 2.5 million and is part of the Hamburg Metropolitan Region, which has a population of over 5.1 million people in total and is the eighth biggest Metropolitan Region by GDP in the European Union. At the southern tip of the Jutland Peninsula, Hamburg stands on the branching River Elbe at the head of a 110 km estuary down to the North Sea, on the mouth of the Alster and Bille. Hamburg is one of Germany's three city-states alongside Berlin and Bremen, and is surrounded by Schleswig-Holstein to the north and Lower Saxony to the south. The Port of Hamburg is Germany's largest and Europe's third-largest, after Rotterdam and Antwerp. The local dialect is a variant of Low Saxon.