Pernik (. Pernik is the most populated city in western Bulgaria after Sofia. It is the main city of Pernik Province and lies on both banks of the Struma River in the Pernik Valley between the Golo Bardo Mountain, Vitosha Mountain, Lyulin and Viskyar mountains.Pernik is the principal city of Pernik Province – a province in western Bulgaria, which is next to the Serbian border. - Source: Wikipedia
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