The Hermannskogel is a forested ridge in the Wienerwald. It is both the highest point in the Kahlengebirge and in the city of Vienna. The Hermannskogel is part of a north-eastern chain of foothills belonging to the eastern Alps. It is composed of flysch containing quartz, limestone, marl, and other conglomerates. The many cliff-like layers on the south-western approach to the Hermannskogel clearly show the hill's geological make-up.