The city of Bremen lies on both sides of the river, about 60km upstream of its estuary on the North Sea and its transition to the Outer Weser by Bremerhaven. Opposite Bremen's Altstadt (Old Town) is the point where the Middle Weser becomes the Lower Weser and, from the area of Bremen's port, the river has been made navigable to ocean-going vessels. The region on the left bank of the Lower Weser, through which the Ochtum flows, is the Weser Marshes, the landscape on its right bank is part of the Elbe-Weser Triangle.
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