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Lake Brienz is located in the canton of Bern in northern Switzerland. It is 14 km long, 2.8 km wide and has an average depth of 173 meters. It is located 560 meters above sea level. It is fed by two rivers: the Aare and the Lütschine. The outflow of the lake is also the river Aare. The main catchment area of the lake is Finsteraarhorn.