Engelberger Aa
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| Engelberger Aa | |
|---|---|
 |
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| Origin | West of Surenenpass |
| Mouth | Lake Lucerne |
| Basin countries | Switzerland |
| Length | 50 km |
| Mouth elevation | 433 m |
| Basin area | 230 km² |
Engelberger Aa (or Engelbergeraa) is a river in Switzerland. It raises west of Surenpass in Uri, flows through the valley of Engelberg (Obwalden) and Nidwalden. At Buochs, it empties into Lake Lucerne. It is a tributary of the river Reuss.
