41°37′N 24°23′E / 41.61°N 24.38°E
Devil's Throat Cave, or Dyavolsko Garlo (Bulgarian: Дяволското гърло [ˈdʲavoɫskoto ˈɡɤrɫo]), is located in the western Rhodopes close to the village of Gyovren in Bulgaria, near its border with Greece. A popular tourist attraction, Devil's Throat branches from Trigrad Gorge.
The Trigrad Gorge (Bulgarian: Триградско ждрело, pronounced [triˈɡratsko ʒdrɛˈɫɔ]) is a canyon of vertical marble rocks in the Rhodope Mountains, part of the Dobrostan Formation (Proterozoic). It is in Smolyan Province, one of the southernmost provinces of Bulgaria.
The gorge encloses the course of the Trigradska River, which plunges into the Devil's Throat Cave and 530 metres (1,740 ft) further emerges as a large karst spring. It later flows into the River Buynovska.