The Nieuwe Maas (or "New Meuse") is a stretch of river in the Netherlands, taking water from the Rhine and the Meuse. It begins at the intersection of the Noord River and the Lek and flows west through Rotterdam. It continues until an intersection with the Oude Maas near the city of Vlaardingen, where it flows into the Nieuwe Waterweg. The total distance is approximately 24km.

Although it is called "Maas", it gets much of its water from the Rhine river, of which it is an important estuary.

Connections between the mainland on the north and IJsselmonde island on the south, from west to east:

  • 1st and 2nd Benelux Tunnel (motor vehicles, cyclists and metro)
  • Maas Tunnel (motor vehicles, cyclists, pedestrians)
  • Erasmus Bridge (motor vehicles, cyclists, pedestrians, trams)
  • metro tunnel
  • Willems Tunnel (trains)
  • Willems Bridge (motor vehicles, cyclists, pedestrians)
  • Van Brienenoordbrug (motor vehicles, cyclists, pedestrians)