|Primary outflows||Seebach to Drava river|
|Max. length||11 km|
|Max. width||1,700 m|
|Surface area||10.5 km²|
|Average depth||19.6 m (64 ft)|
|Max. depth||52 m (171 ft)|
|Water volume||206 km³|
|Residence time||1.8 years|
|Surface elevation||501 m (1644 ft)|
|Settlements||Annenheim, Sattendorf, Bodensdorf, Steindorf, Ossiach|
Lake Ossiach (German: Ossiacher See, Slovene: Osojsko jezero) is a lake in the Austrian state of Carinthia, situated in the Nock Mountains between the towns of Villach and Feldkirchen. It is the third largest lake in Carinthia, superseded only by Lake Wörth and Lake Millstatt.
Lake Ossiach is a dimictic lake with mixing periods in spring and in late autumn. In summer the waters reach 24°C.
There are five main villages surrounding the lake, all of them mainly dependent on summer tourism: Annenheim and Sattendorf, parts of the market town of Treffen, Bodensdorf, part of Steindorf and Ossiach, after which the lake is named.
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