Osser, Mountain summit in the Kunisch Mountains, Bavarian Forest and Bohemian Forest, Germany/Czech Republic
The Osser is a twin-peaked mountain on the German-Czech border in the Kunisch Mountains. The Großer Osser (1,293 m) carries the summit rock about 10–15 m inside Germany, while the Kleiner Osser (1,266 m) lies entirely in Bavaria. Both peaks are built of quartz-rich, strongly folded mica schist, and the Großer Osser rock contains garnets up to 4 mm across.
A small watch castle, roughly 30 by 30 metres, stood on the summit of Ostrý, probably built at the end of the 13th century. Its only surviving trace is a ditch cut into the rock of the summit ridge. The site is discussed by Jiří Fröhlich in Castellologica bohemica 5 (1996).
Czechs call the twin peaks "the breasts of the Mother of God", a nickname recorded by the Domažlice dean Karel Hájek in 1872 and often used by the writer Jindřich Šimon Baar. In Lam the mountain is known as the "Matterhorn of the Bavarian Forest".
Hiking trails approach the summit from several starting points including Lohberg, Silbersbach, and Lam, all requiring sturdy footwear due to rocky terrain. Routes vary in difficulty, allowing hikers to choose based on their experience level.
A mountain hut called Haus Willmann operates on the summit, managed by the Bavarian Forest Club and offering overnight stays. Its presence makes the location a popular rest point for multiday hiking routes through the region.
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