The Trigrad Gorge is a canyon of vertical marble rocks in the Rhodope Mountains of Bulgaria's very southern parts.

The gorge encloses the course of the Trigrad River that plunges into the Devil's Throat cave and 530 m further comes out as a large karst spring. It laters flows in to the Byunovska River.

The gorge's west wall reaches 300 m in height, while the east one extends up to 300--350 m. In the beginning, the distance between the two walls is about 300 m, but reaches about 100 m in the north. The Trigrad Gorge is located 1.2 km from the village of Trigrad at 1,450 above sea level and has a total length of 7 km, of which the real part is 2--3 km.

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