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The Ilm near Langewiesen
|⁃ location||Thuringian Forest|
|Length||129 km (80 mi)|
|Basin size||1,043 km2 (403 sq mi)|
|Progression||Saale→ Elbe→ North Sea|
In the valley of Ilm river runs the federal motorway 87 from Ilmenau to Leipzig and two railways: the Thuringian Railway between Großheringen and Weimar and the Weimar–Kranichfeld railway. Part of the Nuremberg–Erfurt high-speed railway also runs through the upper part of the valley near Ilmenau.