The cave serves as a hibernation site for 11 different species of bats.
The name 'Dupnisa' is derived from the Old Bulgarian word 'dupka,' meaning 'hole' or 'cave.'
The cave system contains three distinct levels, each representing different stages of geological evolution.
The underground stream in the Sulu Cave eventually feeds into the Rezve River, which forms the border between Turkey and Bulgaria.
A specialized lighting system is used to protect the cave's ecosystem from algae growth and light pollution.
The cave floor in the active sections features significant dripstone formations, including stalactites and stalagmites.
Dupnisa Cave is a large, three-level subterranean system located in the Istranca (Yıldız) Mountains of Turkish Thrace. The complex is divided into three distinct sections: the dry Kuru Cave, the semi-active Kız Cave, and the water-filled Sulu Cave. The system spans a total length of approximately 2,720 meters, though only specific sections are accessible to the public. It serves as a significant wintering ground for several species of bats, with populations reaching tens of thousands during hibernation. The internal temperature remains relatively stable throughout the year due to the cave's geological depth. Visitors traverse the accessible routes via steel walkways and lighting installations designed to minimize environmental impact. The surrounding forest environment features lush, high-biodiversity vegetation characteristic of the northern Thracian climate. It is one of the few cave systems in the region with an active underground stream.
The illuminated walkway near the entrance of the Sulu Cave, capturing the reflection of formations in the underground stream.
Bring a light jacket as temperatures inside the cave are significantly lower than outside, even in summer.
Wear non-slip, closed-toe walking shoes to navigate damp and uneven steel grating safely.
Visit during the shoulder months to avoid the crowds that typically arrive during the height of the summer season.
Attempting to enter non-tourist sections or restricted areas which are closed for ecological conservation.
The cave is closed to visitors during the winter months to protect the hibernating bat colonies.
Do not use camera flashes inside the cave to avoid disturbing the bat populations; refrain from touching cave formations.
