Achen Lake

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Achen Lake
in autumn
Achen Lake
Location	Tyrol
Coordinates	47°26′N 11°43′E / 47.433°N 11.717°E / 47.433; 11.717
Primary inflows	Buchauer Bach, Dalfazer Bach, Wankratz Bach
Primary outflows	Achen Bach
Basin countries	Austria
Max. length	9.4 km (5.8 mi)
Max. width	1 km (0.62 mi)
Surface area	6.8 km2 (2.6 sq mi)
Max. depth	133 m (436 ft)
Water volume	0.481 km3 (0.115 cu mi)
Surface elevation	929 m (3,048 ft)

Lake Achen (German: Achensee) is a lake in Austria, north of Jenbach in Tyrol. Lake Achen is also called "Fjord of the Alps" and "Tyrolean Sea".^[1] The largest lake within the federal state, its maximum depth is 133 metres (436 ft). Together with the Achen Valley, it parts the Karwendel mountain range in the west from the Brandenberg Alps in the east.

Water quality is near that of drinking water, with sight up to ten metres (33 ft) below the surface. An alpine lake, water temperature is accordingly low, rarely above 20 °C (68 °F). Its size and wind conditions make it suitable for windsurfing.

Eben am Achensee, Achenkirch, and Pertisau are municipalities on the lake. The Achensee and its hinterland serves as the model for the 'Tiernsee', setting of the Chalet School series of children's books by Elinor M. Brent-Dyer.