Sofular Cave
Sofular Cave (Sofular Mağarası) is a cave located north of Sofular village of Zonguldak Province, northern Turkey. This cave is only for cavers, there is a lot of climbing involved. The cave is a geosite of the Geopark and there is an educational sign outside, the cave on the other hand is not accessible.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).