Prien
General data
- Name: Prien
- Water system: Danube
- Water type: River
- Progression: Chiemsee -> Alz River -> Inn River -> Danube -> Black sea -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: Europe
- Countries: Germany
Its source is at 1,150 metres (3,770 ft) above sea level at the Spitzstein. After 33 kilometres (21 mi) it discharges into the Chiemsee at the bay Schafwaschener Bucht. It is one of the longest mountain streams in the Bavarian Alps.