The Westerbach is a right tributary of the Kahl in the northern Spessart in Lower Franconia, Bavaria, Germany.[ citation needed ]
It is 6.3 km (3.9 mi) long (7.2 km including Querbach) and begins at the confluence of Querbach and Huckelheimer Bach in Westerngrund. The Querbach rises in the Arzborn, a small opening in the mountainside on the Hoher Querberg, northeast of Huckelheim, near the border between Hesse and Bavaria. In Schöllkrippen the Westerbach empties in the Kahl.[ citation needed ]
Together with the Sommerkahl, Reichenbach and Geiselbach, the Westernbach is one of the largest tributaries of the Kahl.[ citation needed ]