|Primary inflows||Aa, Grosse Melchaa, Dreiwässerkanal|
|Primary outflows||Sarner Aa|
|Max. length||5.7 km (3.5 mi)|
|Max. width||1.6 km (0.99 mi)|
|Surface area||7.5 km2 (2.9 sq mi)|
|Average depth||31 m (102 ft)|
|Max. depth||51 m (167 ft)|
|Water volume||239 million cubic metres (194,000 acre·ft)|
|Residence time||0.8 years|
|Surface elevation||469 m (1,539 ft)|
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 on the shores of the lake, and the Brünig railway line follows the eastern shore.
- map.geo.admin.ch (Map). Swiss Confederation. Retrieved 2013-01-05.
- "The Sarner See, Evening, Joseph Mallord William Turner". Tate, London. Retrieved 2013-01-06.
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