Muhalnitsa Protected Area, or the Frog Marsh, is famous for the one of a kind migration of the mountain frog Rana temporaria. The marsh is situated in an area of 1.9 ha and takes the lowest part of a marshy field, which dries up in the summer and fills with water when the snow melts. The frogs come down from the southern slopes of Stara Planina and at the first thawing and melting of snow in early February they appear in the marsh, where they begin breeding.
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