Seealpsee is a lake in the Alpstein range of the canton of Appenzell Innerrhoden, Switzerland.

A network of routes around Ebenalp connects Seealpsee with other notable sights in the Appenzell Alps, such as the Wildkirchli and Säntis.

The Seealpsee provides hydroelectric power and drinking water to the town of Appenzell through the Kraftwerk Seealpsee-Wasserauen [de], which is run by the Feuerschaugemeinde.

[1] The Berggasthaus Forelle am Seealpsee, with a large open air terrace, dominates the western end of the lake.

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