The Sarner Aa is a long

river A river is a natural flowing watercourse, usually freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the ...

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 Internati ...

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 gover ...

. 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 flo ...

, flowing through the Lake Lungern,

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 l ...

and the

Wichelsee Wichelsee is a lake in Obwalden, Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other c ...

, 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 ar ...

. 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 village ...

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 ''Saxhsl ...

Sarnen Sarnen is a small historic town, a municipality, and the capital of the canton of Obwalden situated on the northern shores of Lake Sarnen (german: Sarnersee) in Switzerland. It has a population of just over 10,000 and is surrounded by countryside ...

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 Kerns ...

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 pass ...

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

towards

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

References

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