The Gießen-Koblenz Lahn Valley is a bowl in western Hesse and eastern Rhineland-Palatinate in Germany that contains the lower course of the Lahn as well as the Limburg Basin. It falls within natural region no. 31 as defined by the BfN. It extends from Leun to the mouth of the Lahn into the river Rhine near Lahnstein. Despite its name it does not reach as far east as Gießen, but ends west of Wetzlar.
Natural divisions
310 Lower Lahn Valley
311 Limburg Basin
311.0 North Limburg Basin Hills
311.00 Ahlbach Börde Plateau
311.01 Elz-Hadamar Basin Edge
311.02 Schupbach-Hof Edge Plateau
311.1 Inner Limburg Basin
311.10 Linter Plateau
311.11 Villmar Basin
311.12 Runkel Lahn Valley Region
311.13 Limburg Lahn Valley Region
311.14 Diezer Pforte
311.2 South Limburg Basin Hills
312 Weilburg Lahn Valley Region
312.0 Gaudernbach Plateau
312.1 Weilburg Lahn Valley
312.11 Löhnberg Valley Region
312.12 Weilburg-Aumenau Lahn Valley
312.2 Edelsberg-Braunfels Plateau
312.21 Braunfels Plateau
312.22 Edelsberg Plateau
The Gießen-Koblenz Lahn Valley region is the western extension of the Marburg-Gießen Lahn Valley region (major unit 348). It continues to the west into the Moselle Valley (major unit 25), which separates it from the Middle Rhine Region (29). To the north it is bordered by the Westerwald and to the south by the Hintertaunus.