Marquartstein is a municipality in the southeastern part of Bavaria, Germany and is part of the Verwaltungsgemeinschaft Marquartstein and Staudach-Egerndach. It is situated in a region called Chiemgau, approximately 10 km south of Lake Chiemsee between Munich and Salzburg, and 30 km west of Salzburg. Most of the area is situated in the valley of the river Tiroler Achen, which separates the village into two parts. Marquartstein is at the edge of the Alps.