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|Location||Salzkammergut, Upper Austria|
|Catchment area||464 km2 (179 sq mi)|
|Max. length||18.9 km (11.7 mi)|
|Max. width||3.3 km (2.1 mi)|
|Surface area||46.2 km2 (17.8 sq mi)|
|Average depth||85 m (279 ft)|
|Max. depth||169 m (554 ft)|
|Water volume||3.943 km3 (3,197,000 acre?ft)|
|Surface elevation||469 m (1,539 ft)|
|Settlements||Seewalchen, Schörfling, Weyregg,|
Steinbach, Unterach, Nußdorf,
Attersee, also known as Kammersee, English sometimes Lake Atter, is the largest lake of the Salzkammergut region in the Austrian state of Upper Austria. It is Austria's third largest lake by area, surpassed only by Lake Constance and Lake Neusiedl, which, however, both extend beyond national borders.
The surface area extends for about 20 km (12 mi) from north to south and 4 km (2.5 mi) from east to west. With an average depth of 85 m (279 ft), its water volume even surpasses the Chiemsee, which is larger by area.
The main inflow is the Seeache creek, which flows out of the nearby Mondsee lake in the southwest. Both Attersee and Mondsee are part of a chain of lakes, beginning with Fuschlsee and Irrsee. The waters flow off with the Ager River down to the Traun which itself discharges into the Danube at Linz.
In the southwest of the lake the Schafberg ("Sheep Mountain"), part of the Salzkammergut Mountains, rises up to 1,782 m (5,846 ft), separating it from the Mondsee lake, whose southern shore borders the state of Salzburg. The Höllengebirge (literally "mountains of hell") karst range, with a height of up to 1,862 m (6,109 ft), is located southeast of the lake.
Due to its steady winds and clean water quality, Attersee is famous for attracting sailors and swimmers alike. During the season numerous sailing competitions are held. One of the most cherished winds on Attersee is the so-called "Rosenwind" meaning "breeze of roses". It is an easterly wind that crosses a castle's rose garden and fills the air across the lake with the smell of roses. The surrounding settlements largely depend on tourism, mainly in spring, summer and autumn.
Because of the lake's size and despite the cold temperatures during winter the lake rarely freezes. The last time the lake was entirely covered with ice was in the late 1940s, when people were seen skating and riding motorcycles across the thickly frozen surface of the lake.
The name Atter, derived from ata meaning "water", probably is of proto-Celtic origin. The shores were already settled in the Neolithic era. In August 1870, remains of prehistoric pile dwellings were found near Seewalchen at the northern end of the lake. The Mondsee group stilt houses since 2011 are part of the UNESCO Prehistoric pile dwellings around the Alps World Heritage Site. Other archaeological findings denote settlement activities in Roman times from the 2nd century BC onwards.
In the middle of the 19th century paddlesteamers were introduced on the lake to ferry mail and goods between the villages located around the Attersee. Today it is an important recreation site for people from the urban areas of Vienna and Linz.
From the Fin de siècle, Attersee became a popular destination for summer guests, apart from the bustle at the emperor's sojourn in nearby Bad Ischl. Near the village of Litzlberg, part of Seewalchen, there is a small island castle, which Gustav Klimt frequently visited during the summer. Likewise, the German painter Albert Weisgerber was a summer visitor on Attersee.
Lake Attersee was a rallying point for several German divisions during World War II which had retreated during the Siege of Budapest. Among these were several foreign volunteer divisions of the Waffen-SS, which sought to reach Attersee where surrender to the Americans was preferable to capture by the Red Army.
Among the fish species found in the lake are: