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In page Skopje:

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The City of Skopje incorporates two artificial lakes, on the Treska. Lake Matka is the result of the construction of a dam in Matka Canyon in the 1930s, and the Treska Lake was dug for leisure purposes in 1978.[3] Three small natural lakes can be found near Smilkovci, on the north-eastern edge of the urban area.[citation needed]