Engelberger Aa

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For other rivers with the same name, see Aa (river).
Engelberger Aa
Engelberger Aa tobel.jpg
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 / 46.97889; 8.42528

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