The submarket City comprises the city centre of Frankfurt and is bordered by the River Main to the south. The submarket City not only comprises the historic centre of Frankfurt, the core of the city centre which is surrounded by a green belt and thus easy to locate on maps, but the area to the north which extends up to the federal road B8 Adickesallee/Nibelungenallee. The heart of the city centre is the pedestrian street Zeil, Frankfurt’s largest and most popular shopping street, as well as the squares Hauptwache and Konstablerwache, which are also the central public transport hubs of Frankfurt.