Trakia-Tours
a journey through the bulgarian history
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National Archaeological Museum (Sofia) |
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Trigradsko Zhdrelo (Trigrad Gorge). The gorge proper is 2 km long and 300 m deep. It has been chiseled by the river Trigradska which today flows deep under the surface of the earth into the vertical cave Dyavolskoto Gurlo (The Devil's Throat) before it emerges on the surface as a karst spring in the narrowest part of the gorge where the distance between the surrounding rocks is 100 m. Listed as a natural sight of international importance in 1963 with an adjacent area of 296.6 ha.
