Natural phenomena "The Wonder Bridges"
The "Wonderful Bridges" (also called "Erkyupria" - from Turkish "er" - land and "kiupria" - bridge) is one of the most spectacular natural phenomena in the Rhodopes. It is located about 5 km northeast of the village of Zabardo. It is assumed the formation was once a cave, formed in marble stock of river of Dalbok Dol, which probably collapsed as a result of an earthquake. The river waters treated the fallen rocks, forming the current two beautiful marble bridges.
The upper bridge is very impressive. It is about 45 meters wide, its vault arch is around 20 km thick, and the abyss underneath it reaches 45 meters in depth. The second bridge is located about 200 meters away from the first and looks like a tunnel with a length of 60 meters. It begins with a wide opening, which gradually narrows and ends as a narrow slit.
The region of The "Wonderful Bridges" is a popular tourist destination and there are 2 huts nearby - "The Wonderful bridges" and "The Rocky Bridges".