Engelberger Aa
| Engelberger Aa | |
|---|---|
 |
|
| Country | Switzerland |
| Basin features | |
| Main source | West of Surenenpass |
| River mouth |
Lake Lucerne 433 m (1,421 ft) |
| Basin size | 230 km2 (89 sq mi) |
| Physical characteristics | |
| Length | 50 km (31 mi) |
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 Reuss, which drains that lake.
Coordinates: 46°58′44″N 8°25′31″E / 46.97889°N 8.42528°E
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