sentences:  Herchweiler lies in the Selchenbach valley, upstream from the upper Oster valley, in the Western Palatinate, right at the boundary with the Saarland.The Selchenbach flows into the village from the south after turning in a broad bow towards the west just south of the village, whence it flows onwards towards the southwest, emptying into the Oster near the neighbouring village of Haupersweiler.Smaller brooks empty into the Selchenbach near Herchweiler, among them the Herchweiler Bach and the Judenbach.