Engelberger Aa

The Engelberger Aa (or Engelbergeraa) is a 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.

Engelberger Aa
The Aaschlucht gorge
Location
CountrySwitzerland
Physical characteristics
Source 
  locationWest of Surenenpass
MouthLake Lucerne
  coordinates
46°58′44″N 8°25′31″E
  elevation
433 m (1,421 ft)
Length50 km (31 mi)
Basin size230 km2 (89 sq mi)
Basin features
ProgressionLake Lucerne→ Reuss→ Aare→ Rhine→ North Sea
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