A distinction is made between the Großer Osser (1,293 m) (Velký Ostrý), which is right on the border, and the Kleiner Osser (1,266 m) (Malý Ostrý) to the west which is entirely within Bavaria. Both summits lie on the German side in the county of Cham and on the municipal boundary between Lohberg to the southeast and Lam to the northwest. Due to their pointed shape, both summits are unique within the Bavarian Forest. They dominate the backdrop of the Lamer Winkel, an area of lowland between Arrach, Lam and Lohberg. The Osser lies in the county of Cham and thus within the Bavarian province of Upper Palatinate.