From Wikimedia Commons, the free media repository
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|Winter scene of the watching tower, dam and Mavrovo Lake, Mavrovo National Park, Republic of Macedonia. The park, founded in 1949, is the largest (of the three existing) in the country with 780 km2, while the lake has a length of 10 km and a width of 5 km.|
Some of my favourite pictures on Commons are listed here.