'Rotterdam' is divided into a northern and a southern part by the river Nieuwe Maas, connected by (from west to east): the Beneluxtunnel; the Maastunnel; the Erasmusbrug ('Erasmus Bridge'); a subway tunnel; the Willemsspoortunnel('Willems railway tunnel'); the Willemsbrug ('Willems Bridge'); theKoninginnebrug ('Queen's Bridge'); and the Van Brienenoordbrug ('Van Brienenoord Bridge'). The former railway lift bridge De Hef ('the Lift') is preserved as a monument in lifted position between the Noordereiland ('North Island') and the south of Rotterdam.
The city centre is located on the northern bank of the Nieuwe Maas, although recent urban development has extended the center to parts of southern Rotterdam known as De Kop van Zuid ('the Head of South', i.e. the northern part of southern Rotterdam). From its inland core, Rotterdam reaches the North Sea by a swathe of predominantly harbour area.
Built mostly behind dikes, large parts of the Rotterdam are below sea level. For instance, the Prins Alexander Polder in the northeast of Rotterdam extends 6 metres below sea level, or rather below Normal Amsterdams Peil (NAP) or 'Amsterdam Ordnance Datum'. The lowest point in the Netherlands (6.76 metres (22.2 ft) below NAP) is situated just to the east of Rotterdam, in the municipality of Nieuwerkerk aan den IJssel.
The Rotte river no longer joins the Nieuwe Maas directly. Since the early 1980s, when the construction of Rotterdam’s second subway line interfered with the Rotte’s course, its waters have been pumped through a pipe into the Nieuwe Maas via the Boerengat
