View to Seebach valley and Ankogel massif
|Primary outflows||Seebach and Mallnitzbach to Möll River|
|Max. length||216 m (709 ft)|
|Max. width||8.4 ha (21 acres)|
|Surface area||3.6 ha (8.9 acres)|
|Average depth||3.6 m (12 ft)|
|Max. depth||6 m (20 ft)|
|Water volume||130,000 m3 (170,000 cu yd)|
|Surface elevation||1,273 m (4,177 ft)|
The lake arose during the last glacial period (Würm glaciation), when the retreat of glaciers led to a Sturzstrom landslide of debris damming up the waters in the Mallnitz valley. After many thousand years of a continuous sedimentation process, Stappitzer See confined by several debris cones is a relict from the ice age.
Plans for a reservoir power station developed by the Österreichische Draukraftwerke AG (present-day Verbund AG) in the 1970s failed due to environmental impacts and local opposition. The lake is a resting area for numerous bird species such as the black-throated loon and the western yellow wagtail, as well as a breeding ground for the little grebe, the Alpine swift, and the Eurasian crag martin. In 1986 it was declared a nature reserve; since 2008 it is a Special Protection Area according to the European Birds Directive.
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