Breitenstein, Mountain summit at Tyrol-Bavaria border, Austria and Germany

Breitenstein is a 1,661-metre summit in the Chiemgau Alps, its crest carrying the border between Bavaria and Tirol. It rises about 1.3 km south of the Geigelstein (1,808 m), between the Prien valley to the west and the Tiroler Ache to the east. From the Priener Hütte the top is reached on an easy path in roughly 45 minutes.

The border between Bavaria and Tirol runs across the Breitenstein summit at 1,661 m, placing the peak between the Prien valley to the west and the Tiroler Ache to the east. The mountain stands about 1.3 km south of the Geigelstein (1,808 m), and the two are linked by the Geigelstein's southwest ridge, which also carries a route to the Breitenstein.

People living on both sides use the mountain pastures for traditional livestock farming that shapes how the landscape looks and functions today. This farming practice remains visible in the grazing patterns and the way locals move through the mountain throughout the year.

Several hiking routes start from Walchsee, Schleching, and Aschau im Chiemgau and lead to the summit with clear trail markings throughout. The paths are well-established and straightforward to follow, making navigation manageable for most visitors.

The summit lies about 1.3 km south of the Geigelstein (1,808 m), between the Prien valley to the west and the Tiroler Ache to the east. From the Priener Hütte the top is reached on an easy path in roughly 45 minutes; other routes climb directly from the Geigelstein over its southwest ridge or from the Wuhrsteinalm.