The Sarner Aa is a long

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

in the

Swiss Swiss may refer to: * the adjectival form of Switzerland * Swiss people Places * Swiss, Missouri * Swiss, North Carolina *Swiss, West Virginia * Swiss, Wisconsin Other uses *Swiss-system tournament, in various games and sports *Swiss Internation ...

canton of Obwalden Obwalden, also Obwald (german: Kanton Obwalden, rm, Chantun Sursilvania; french: Canton d'Obwald; it, Canton Obvaldo), is one of the 26 cantons forming the Swiss Confederation. It is composed of seven municipalities and the seat of the govern ...

. It drains the area to the eastern side of the

Brünig Pass The Brünig Pass, at an altitude of , connects the Bernese Oberland and central Switzerland, linking Meiringen in the canton of Bern and Lungern in the canton of Obwalden. It is on the watershed between the upper reaches of the Aare, which flows ...

, flowing through the

Lake Lungern Lake Lungern (german: Lungerersee, also spelled ''Lungernsee'' or ''Lungerensee'') is a natural lake in Obwalden, Switzerland which is named after the town Lungern on its shore. The lake is drained by the Sarner Aa river, which flows through the S ...

Lake Sarnen Lake Sarnen (German: ''Sarnersee'') is a lake in the Swiss canton of Obwalden. The lake is on the Sarner Aa, which flows out of the Lake Lungern, through the Lake Sarnen, and into Lake Lucerne. The municipalities of Sarnen and Sachseln are located ...

and the

Wichelsee Wichelsee is a lake in Obwalden, Switzerland. Its surface area is . The reservoir is located in the municipalities of Alpnach and Sarnen. It formed after the Sarner Aa The Sarner Aa is a long river in the Swiss canton of Obwalden. It drains th ...

, before entering

Lake Lucerne __NOTOC__ Lake Lucerne (german: Vierwaldstättersee, literally "Lake of the four forested settlements" (in English usually translated as ''forest cantons''), french: lac des Quatre-Cantons, it, lago dei Quattro Cantoni) is a lake in central ...

near

Alpnach Alpnach is a village in the canton of Obwalden in Switzerland. It comprises the villages of Alpnach Dorf, Alpnachstad and Schoried. History Alpnach is first mentioned about 870 as ''Alpenacho''. Geography Alpnach has an area, , of . Of this are ...

. 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. Along its length, the Sarner Aa flows through or near the settlements of

Lungern Lungern is a municipality in the canton of Obwalden in Switzerland. It encompasses Lake Lungern and, besides the village of Lungern, the settlements of Bürglen, Kaiserstuhl and Obsee. Geography The village of Lungern lies above sea level in ...

Giswil Giswil is a municipality in the canton of Obwalden in Switzerland. History Giswil is first mentioned in the 11th century, as ''Kisevilare''. Geography The municipality is located on the southern end of Lake Sarnen. It consists of the villag ...

Sachseln Sachseln is a village and municipality in the canton of Obwalden in Switzerland. Besides the village of Sachseln, the municipality includes the hamlets of Edisried, Ewil and Flüeli-Ranft. History Sachseln is first mentioned in 1173 as ''Saxhslen ...

Sarnen , neighboring_municipalities= Alpnach, Entlebuch (LU), Flühli (LU), Giswil, Hasle (LU), Kerns, Sachseln , twintowns = Sarnen is a small historic town, a municipality, and the capital of the canton of Obwalden situated on the northern shores of ...

Kerns Kerns may refer to: * Plural of Kern * Kerns (surname) * Kerns, Ontario, Canada * Kerns, Portland, Oregon, United States * Kerns, Switzerland, a village and municipality See also * * Kernstown, Virginia, United States ** Battle of Kernsto ...

and

. The

Brünig railway line The Brünig railway line (german: Brünigbahn) is a Swiss narrow gauge railway line that links Lucerne, in central Switzerland, with Interlaken, in the Bernese Oberland. The line runs via Alpnachstad, Giswil, Meiringen and Brienz, and passes ov ...

follows the valley of the Sarner Aa in its descent from the

towards

Lucerne Lucerne ( , ; High Alemannic German, High Alemannic: ''Lozärn'') or Luzern ()Other languages: gsw, Lozärn, label=Lucerne German; it, Lucerna ; rm, Lucerna . is a city in central Switzerland, in the Languages of Switzerland, German-speaking po ...

References

Rivers of Obwalden Rivers of Switzerland {{Switzerland-river-stub