It is a cave in the city in the province of Zonguldak and is located on the sea shore at 15 kilometers of Kilimli road. The cave, which has a total length of 800 meters, is entered through a fossil mouth facing the sea.

From a height of 50 meters, it continues with an underground stream in places after a hole where a person can only fit. There is a siphon at 400 meters and it can be passed by walking in the period when the water is drawn. From here, it progresses 400 meters further and ends with a siphon.