Location : Zonguldak
It is a cave situated in the city of Zonguldak province at the sea coast at the 15th km of Kilimli road.
Properties : The entry to the cave with a total length of 800m is made from the fossil inlet facing the sea. After a hole one man can hardly pass at the 50th meter it continues sporadically with fossils and rich formations and sporadically with an underground creek.

There exists a siphon at the 400th meter, and it can be distinguished by walking in the period when water is drawn. From here, it ends with the siphon after 400 meters.