The Ilmenau is a river in the south of Hamburg, Lower Saxony, Germany, which is one of the left tributaries of the Elbe. It originates in the Lüneburg Heath, south of Uelzen. It empties into the Elbe near Winsen (Luhe). The Ilmenau is 107km long. The largest towns along the Ilmenau are Uelzen and Lüneburg. The city Ilmenau in Thuringia is not along the river Ilmenau but along the river Ilm (Thuringia).Even though this waterway is hardly used,yet it is used for some other important works like boating license essential,etc.