Hamburg's most important attractions stretch between the Alster Lakes to the north, and the harbor and Elbe River to the south. This area consists of four distinct quarters. St. Georg is the business district around the Hauptbahnhof (main train station). The historic Altstadt (Old City) clusters near the harbor and surrounds the Rathaus (Town Hall). West of Altstadt is Neustadt (New City). The shabby but thrilling district of St. Pauli includes the Reeperbahn, a strip of sex clubs and bars.