Havelbus, or Havelbus Verkehrsgesellschaft mbH, is the largest bus operating company in Brandenburg, Germany, serving the areas of Potsdam, Potsdam-Mittelmark and Havelland.
The old Margraviate was essentially only the eastern portion of Havelland and the Zauche.
From here the beltway runs northwards to the Havelland interchange with the Bundesautobahn 24 to Hamburg, and finally turns eastwards to the Oranienburg and Pankow interchanges with the Bundesautobahn 111 and Bundesautobahn 114 motorways both leading to the Berliner Stadtring.