The Limburg Basin (German: Limburger Becken) is one of the two large intramontane lowland areas within the Rhenish Massif in Germany, the other being the Middle Rhine Basin. It forms the central part of the natural region of the Gießen-Koblenz Lahn Valley between the Weilburg Lahn Valley Region and the Lower Lahn Valley on both sides of the Lahn around the town of Limburg.