Kreis 3, known as Wiedikon is between the Sihl and the Uetliberg, and contains the neighbourhoods of Alt-Wiedikon, Sihlfeld and Friesenberg. Kreis 4, known as Aussersihl lies between the Sihl and the train tracks leaving Zürich Hauptbahnhof, and contains the neighbourhoods of Werd, Langstrasse, and Hard. Kreis 5, known as Industriequartier, is between the Limmat and the train tracks leaving Zürich Hauptbahnhof, it contains the former industrial area of Zürich which has gone under a large-scale rezoning to create upscale modern housing, retail and commercial real estate.