Engelberger Aa
 |
| Engelberger Aa | |
|---|---|
 | |
| Location | |
| Country | Switzerland |
| Physical characteristics | |
| Source | |
| • location | West of Surenenpass |
| Mouth | Lake Lucerne |
• coordinates | 46°58′44″N 8°25′31″E / 46.97889°N 8.42528°E |
• elevation | 433 m (1,421 ft) |
| Length | 50 km (31 mi) |
| Basin size | 230 km2 (89 sq mi) |
| Basin features | |
| Progression | Lake Lucerne→ Reuss→ Aare→ Rhine→ North Sea |
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.
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