Dupnisa Cave

Located within the boundaries of the Demirköy district of Kırklareli Province, near the border with Bulgaria, the Dupnisa Cave is one of the most notable subterranean formations in the Thrace Region, both geologically and biologically. This karst cave, situated within the forested areas of the Istranca Mountains, has become a focal point for scientific research and conservation-based tourism. It represents a multifaceted natural heritage site due to its surface features, bat populations, travertine formations, and its significance in the cultural narratives of the local community.

Dupnisa Cave is located approximately 58 kilometers northeast of the city center of Kırklareli and about 6 kilometers southeast of Sarpdere Village, which belongs to the Demirköy district. It lies roughly 5 kilometers from the Bulgarian border. Access to the cave is via road, and it is heavily visited by individual tourists and groups, especially during the summer months. The surrounding area is covered by forested land and forms part of a natural ecosystem.

^{Image showing the interior of Dupnisa Cave. (}Anadolu Agency⁾

Dupnisa Cave is a karst formation developed within limestone structures dating back to the Jurassic period, approximately 180 million years ago. The total length of the cave system is 3,200 meters and consists of three main sections:

• Wet Cave: The longest section of the cave system, the Wet Cave measures 2,720 meters in length. The underground stream and small lakes flowing through it indicate that active karstification processes are still ongoing.
• Dry Cave: Connected to the Wet Cave, this section features typical cave geomorphological formations such as stalactites, stalagmites, columns, and wall deposits.
• Girl’s Cave: Located at a higher elevation than the Wet Cave, this section derives its name from a tragic love story told by the local population.

Only 500 meters of the cave are open to tourism, and this area is equipped with interior lighting, walking paths, and informational panels.

Dupnisa Cave is one of the rare sites in Türkiye where bat populations are found in high density. Approximately 60,000 individuals belonging to 16 different species inhabit the cave. Among these species are several that are endangered and designated as conservation priorities. Bat species play a vital role as components of biological diversity within the cave’s ecosystem.

Consequently, the ecological balance of the cave is under protection. To prevent disruption to the bats’ hibernation and reproductive cycles, Dupnisa Cave is closed to visitors annually from November 15 to May 15. This practice constitutes a management model designed to maintain a balance between conservation and tourism.

^{Image of the transition zone between the Wet Cave and the Dry Cave. (}Ministry of Culture and Tourism⁾

In 2003, the cave was opened to controlled tourism following infrastructure development projects carried out by the General Directorate of Forestry. The entrance area, walking platforms, and interior lighting systems have been designed to ensure visitor safety and protect the natural structure.

Activities such as nature walking, cave observation, photography, and ecotourism are commonly practiced around Dupnisa Cave. The majority of visitors consist of nature enthusiasts, students, researchers, and domestic tourists.

A local legend associated with the Girl’s Cave section of Dupnisa Cave is significant in demonstrating the cave’s place in cultural memory. According to the tale, two young lovers who could not marry due to societal restrictions agreed to meet secretly inside the cave. The girl arrived early but disappeared within the cave before her lover arrived. After this event, the cave began to be known as the Girl’s Cave.

This narrative illustrates that Dupnisa Cave is not merely a natural formation but also a symbolic space embedded in oral culture. In this sense, Dupnisa Cave embodies the interaction between nature and culture.

^{Image showing dripstone formations inside Dupnisa Cave. (}Ministry of Culture and Tourism⁾

Dupnisa Cave is one of the protected areas coordinated by the Ministry of Culture and Tourism and the General Directorate of Forestry. The seasonal closure implemented specifically to safeguard bat populations enables tourism to occur without disrupting the cave’s natural life cycles.

Access to areas outside the designated tourist zones is restricted, and special permits are required for scientific research. Conservation measures aim to ensure the continuity of biological diversity and promote ecotourism in a sustainable manner.

^{Image of the Lovers’ Stone at Dupnisa Cave. (}Ministry of Culture and Tourism⁾

Dupnisa Cave is one of the most prominent natural formations in the Thrace Region, notable both for its geomorphology and ecology. Its karst structure, underground water system, bat populations, and cultural narratives make it a multidimensional site for research and observation. Supported by controlled tourism activities and conservation policies, this area is regarded as an example of sustainable management of regional natural heritage.