The Thuringian Forest (Thüringer Wald in German), is a mountain range in the southern parts of the German state of Thuringia, running northwest to southeast between the valley of the river Werra near Eisenach and the Thuringian-Vogtlandian Slate Mountains. The geographical boundary with the latter range follows approximately a line from Gehren via Großbreitenbach to Schönbrunn near Schleusingen, defined by the rivers Schleuse and Neubrunn on the southwestern slope, and Talwasser, Wohlrose and Möhre on the northeastern slope.