|Location||St. Gallen, Glarus|
|Primary inflows||Linth (Escherkanal), Seez, Murgbach|
|Primary outflows||Linth canal|
|Surface area||24.19 km²|
|Average depth||104.7 m|
|Max. depth||151 m|
|Water volume||2.5 km³|
|Residence time||1.4258 years|
|Surface elevation||419 m|
|Settlements||Walenstadt, Weesen, Quinten, Quarten, Murg|
The Walensee is one of the larger lakes in Switzerland, for about 2/3 of its surface in the Canton of St. Gallen and for 1/3 in the Canton of Glarus. It is also known as Lake Walen or Lake Walenstadt, after Walenstadt. Other towns and villages at the lake include: Weesen, Quinten, Quarten, and Murg.
The Churfirsten range raises steeply on the North side from the lake's level at 419 m to 2,300 m above sea level.
The lake provided the inspiration for a solo piano piece by Hungarian romantic composer Franz Liszt, called Au lac de Wallenstadt. The piece is part of a collection of solo piano works inspired by the composer's travels in 1830s Switzerland.