One of the phenomenons in the Rhodope Mountains is the Trigradsko jdrelo where is located a cave called Dyavolsko Gurlo (The Devil's Throat). The cave is 1, 2 km of the village of Trigrad and has formed as a result of massive tectonic activities. The name of the cave has derived from the devil head shaped entrance. There is a river crossing underground the cave, with 60m high waterfall, forming a huge hall called the Thunder hall. It is 110m long, 40m wide and 35m high. There is an artificial gallery through which one can access the base of the water current and from there is 301 stairs with access to the outside in the open. There, the nature demonstrated its magnificence. From 380 m from the cave's entrance, the running river deposits in a siphon gallery. The length of the siphon is more than 150m the River undergo into another gallery of about 60m, after which it rushes outside the cave.

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