Bremerhaven is a city on the east bank of the Weser estuary in northern Germany. It forms an exclave of the city-state of Bremen. The River Geeste flows through the city before emptying into the Weser.

The Weser is a river of Lower Saxony in north-west Germany. It begins at Hannoversch Münden through the confluence of the Werra and Fulda. It passes through the Hanseatic city of Bremen. Its mouth is 50 km (31 mi) further north against the ports of Bremerhaven and Nordenham. The latter is on the Butjadingen Peninsula. It then merges into the North Sea via two highly saline, estuarine mouths.