Mitte is the first and most central borough of Berlin. It was created in Berlin's 2001 administrative reform by the merger of the former districts of Mitte proper, Tiergarten and Wedding; the resulting borough retained the name Mitte. It is one of the two boroughs (beside Friedrichshain-Kreuzberg) which comprises former West and East Berlin districts.
Mitte encompasses Berlin's historic core and includes some of the most important tourist sites of Berlin like Museum Island, Brandenburg Gate, Unter den Linden, Potsdamer Platz, the Reichstag and Berlin Hauptbahnhof, most of which were in former East Berlin. Note that when Berliners speak of Mitte, they usually refer to the smaller locality and not to the larger borough.
The central square in Mitte is Alexanderplatz with the prominent Fernsehturm (TV tower), Germany's highest building, and the large railway station with connections to many subway (U-Bahn), tramway (Straßenbahn), city trains (S-Bahn) and buses. There are some important streets which connect Mitte with the other boroughs, e.g. the boulevard Unter den Linden which connects Alexanderplatz to the west with Brandenburg Gate and runs further as Straße des 17. Juni to the Victory Column and the centre of former West Berlin in Charlottenburg, or Karl-Marx-Allee from Alexanderplatz to Friedrichshain and the eastern suburbs.