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.
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Водопад Зелената Скала и Деветашката пещера – Крушунски водопади
Lua Cheia na Grécia -
The Natural Beauties of Bulgaria via Photos of Ivan Miladinov - Krushuna Falls