The Trigrad Gorge is a canyon of vertical marble rocks in the Rhodope Mountains. It is in Smolyan Province, one of the southernmost provinces of Bulgaria. The gorge encloses the course of the Trigrad River, which plunges into the Devil's Throat Cave and 530 metres further emerges as a large karst spring. It later flows into the River Buynovska. The gorge's west wall reaches 300 metres in height, while the east one extends up to 300–350 metres . Initially, the two walls are about 300 m apart, but the gorge narrows to about 100 metres in the northern section. The gorge is 1.2 kilometres from the village of Trigrad at 1,450 metres above sea level and ha...
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