The Niederelbe (i.e. Lower Elbe) is a 108 kilometers (67 miles) long section of the river Elbe, from western Hamburg downstream to its mouth into the North Sea near Cuxhaven.

Starting at Mühlenberger Loch [de; nds] (or Elbe kilometer 634) near Finkenwerder, Hamburg, it gradually widens from 2 km (1.2 mi) to 18 km (11 mi).

Once passing the Hamburg state border, the Niederelbe also forms the border between the states of Lower Saxony and Schleswig-Holstein.

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