Engelberger Aa

General data
- Water type: River
- Progression: Lake Lucerne -> Reuss -> Aare -> Rhine -> Waal -> Upper Merwede (Boven Merwede) -> Lower Merwede (Beneden Merwede) -> Old Meuse (Oude Maas) -> Het Scheur -> Nieuwe Waterweg (New Waterway) -> North Sea -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: Europe
- Countries: Switzerland
Description
The Engelberger Aa (or Engelbergeraa) is a 50 km long river in Switzerland. It rises west of the Surenenpass in the Canton of Uri, flows through the valley of Engelberg (Obwalden) and Nidwalden. At Buochs it flows into Lake Lucerne and is therefore a tributary of the Reuss, which drains the lake.