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Kiril Penev: Yumruk kaya, Dam Studen Kladenets
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Kiril Penev: Ustra fortress
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Kiril Penev: Ustra fortress
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Kiril Penev: Ustra fortress
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Kiril Penev: Maslen Cape
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Kiril Penev: Kazankite Waterfall
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Kiril Penev: Waterfall Waterless
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Kiril Penev: Letovnishki waterfall
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Kiril Penev: Sakar
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Kiril Penev: Madjarovsky waterfall