Engelberger Aa
| Engelberger Aa | |
|---|---|
 | |
| 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 rises west of Surenenpass in the Canton of Uri, flows through the valley of Engelberg (Obwalden) and Nidwalden. At Buochs, it empties into Lake Lucerne and is thus a tributary of the river Reuss, which drains that lake.
Coordinates: 46°58′44″N 8°25′31″E / 46.97889°N 8.42528°E
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