Towering and sheer.
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The Trigrad Gorge is a canyon of vertical marble walls in the Rhodope Mountains, in Smolyan Province in Bulgaria's far south. It begins 1.2 km from the village of Trigrad, about 27 km in a straight line from the town of Smolyan. The gorge holds the Trigradska River, which plunges into the Devil's Throat Cave and emerges 530 metres later as a large karst spring. Its west wall reaches 300 metres and its east wall 300 to 350 metres, narrowing from about 300 metres apart to about 100 metres in the north. It runs 7 km in all and is one of only three river gorges in the world cut entirely through pure marble. It has been protected since the early 1960s. The road runs along the floor between two towering grey walls that almost meet overhead, with pines clinging to the cracks. Above, green forest covers the clifftops, and the river runs among the rocks. You can pass through by car or on foot along the road, with the Devil's Throat Cave midway. Watch for traffic on the narrow road.
Towering and sheer.
Along the floor.
Among the rocks.
Near Trigrad village, Smolyan Province, Bulgaria
Yes, or walk the road.
The Devil's Throat Cave.