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People enjoy skating and walking on and around the frozen "Oeschinensee" mountain lake (1'578 meters above sea level) near Kandersteg in the Bernese Oberland, Switzerland, Friday, December 25, 2015. The lake is generally frozen during five months, from December to May. Because of the missing of precipitation in this winter, the ice is not covered by snow and so called "black ice" frozen, which happens very rarely. (KEYSTONE/Peter Klaunzer)