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|Source||near Brünig Pass|
|Length||28 km (17 mi)|
|Progression||Lake Lucerne→ Reuss→ Aare→ Rhine→ North Sea|
The Sarner Aa is a 28 km (17 mi) long river in the Swiss canton of Obwalden. It drains the area to the eastern side of the Brünig Pass, flowing through the Lake Lungern, Lake Sarnen and the Wichelsee, before entering Lake Lucerne near Alpnach. It goes by several names over its length, being known as the Lauibach upstream of the Lungerersee, and the Aa or Aawasser between the Lungerersee and Lake Sarnen.
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