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The Marvelous Bridges or Wonderful Bridges (Bulgarian: Чудни[те] мостове, Chudni[te] mostove) are natural arches in the Rhodope Mountains of southern Bulgaria. They are located in the karst valley of the Erkyupriya River in the Western Rhodopes at 1,450 metres (4,760 ft) metres above sea level, at the foot of Persenk Peak.