The Unterelbe or, in English usually the Lower Elbe, refers to the lower reaches of the river Elbe in Germany influenced by the tides. It starts at kilometre 586, at the

sluice Sluice ( ) is a word for a channel controlled at its head by a movable gate which is called a sluice gate. A sluice gate is traditionally a wood or metal barrier sliding in grooves that are set in the sides of the waterway and can be considered ...

of Geesthacht, where the Elbe forms the border between Lower Saxony and Schleswig-Holstein. It continues downstream, then forming the border between Lower Saxony and Hamburg, before fully entering Hamburg territory. In Hamburg the Unterelbe forms two

anabranch An anabranch is a section of a river or stream that diverts from the main channel or stem of the watercourse and rejoins the main stem downstream. Local anabranches can be the result of small islands in the watercourse. In larger anabranches, th ...

es, Norderelbe and Süderelbe, the latter now partially a cut-off meander. Where Norderelbe and Süderelbe used to reunite, at kilometre 634 there is a bay called the . This marks the beginning of the section of the Unterelbe which called the Niederelbe. After leaving Hamburg it forms the border between Lower Saxony and Schleswig-Holstein, again. The end it defined by the Kugelbake in Cuxhaven at kilometre 727.73. It continues further into the

Wadden Sea The Wadden Sea ( nl, Waddenzee ; german: Wattenmeer; nds, Wattensee or ; da, Vadehavet; fy, Waadsee, longname=yes; frr, di Heef) is an intertidal zone in the southeastern part of the North Sea. It lies between the coast of northwestern conti ...

as the Außenelbe, where it passes the Hamburg islands Scharhörn and

Nigehörn Nigehörn is an uninhabited artificial island in the North Sea belonging to the German city of Hamburg. Geography Located by the mouth of the Elbe, Nigehörn lies on the same sandbank as Scharhörn, about northwest of Neuwerk and northwest fr ...

See also