The formation was declared a natural landmark in 1949 to preserve its unique geological character.
The tunnels were created by the combination of water erosion and human-made construction during the development of a nearby road passage.
The reservoir at the base of the rocks covers an area of approximately 17 square kilometers.
The rock color changes significantly depending on the angle of the sun, shifting from light gray to golden or dark brown.
The surrounding limestone region contains fossils from the Tertiary period.
Wonderful Rocks, or 'Chudnite Skali', consist of a group of over ten limestone pillars reaching heights of 40 to 50 meters. The formations were created by the erosion of the Devnya River and the subsequent winds acting upon the soft sedimentary rock. The site is located directly on the western shore of the Tsonevo Reservoir, a large artificial lake in eastern Bulgaria. Three natural tunnels carved through the rock mass allow pedestrians to walk directly through the pillars. The geological structure is composed of limestone deposits dating back to the Eocene epoch. Because of their vertical orientation and porous structure, the rocks resemble a castle or fortress from a distance. The area serves as a habitat for various birds, including raptors that nest in the rock crevices.
The elevated vantage point on the road side looking back toward the rocks with the reservoir as the backdrop.
Wear shoes with high-grip rubber soles, as the limestone surfaces can be slippery and uneven.
The most accessible tunnels are at the base; be prepared to crouch or duck in some segments.
Bring binoculars if you are interested in birdwatching, as the cliffs attract nesting birds of prey.
Do not attempt to swim in the reservoir near the rocks, as underwater currents and sharp submerged limestone debris are present.
Do not climb the unstable limestone walls to protect both the geological integrity of the site and your personal safety.
