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Fakilli Cave, known for its natural formations in Duzce's Akcakoca district on Türkiye's Black Sea coast, welcomes an average of 40,000 visitors each year.
Located eight kilometers from the district center, the cave contains naturally formed stalactites and stalagmites, along with galleries extending in various directions, ranking among the region's major tourism destinations.
The cave takes its name from the nearby village of Fakilli. It is classified as a semi-active cave shaped by geological development across multiple periods, and because it lies close to the surface, its internal atmosphere shifts between humid, warm, and cool conditions depending on the season. Significant amounts of water enter the cave through sinkhole openings during rainy periods.
Visitors arriving mainly from Istanbul and Ankara, along with neighboring provinces, tour the 350-meter section open to the public within the cave's total length of 1017 meters.
Visitors touring the natural formations are particularly interested in areas rich in dripstone formations, known as the "white room."
The cave is open to visitors daily from 8:30 a.m. to 10 p.m.
Fakilli Cave is registered as a first-degree protected site by the Ministry of Culture and Tourism's Regional Directorate for the Conservation of Cultural and Natural Heritage.
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