Location : Zonguldak
The cave which is situated in Kizilelma quarter of Ayiçi Village of Gelik District of Zonguldak Province can easily be reached by cars.
Properties : Water of Aydin Creek and Büyükay Creek sinks at the active inlet. The cave is entered through the fossil inlet (30x10m.) located at the upper part, and after 100 meters water is met. The cave continues

horizontally together with the water. After the first 100 meters, it is possible to go by creeping for 400 meters, a siphon of 10 meters exists. This siphon can be passed in the Autumn. The gallery in the cave has great dimensions after the siphon.
At the 3200th m. of the cave which continues as a single active gallery basically, there is a chimney with the height of 80 meters which is enough to illuminate the lake at the base. The cave continuing 3 km. along with the lakes ends with the 2nd siphon. The researches related with some branches and the last siphon in the cave has not been concluded, yet. It has been determined via the researches carried out by paint experiments that the sunk water appears in Cumayani Cave after 2 km.
Thus, the total length of the underground system (Kizilelma - Cumayani) reaches to 10kms. Once, it was the longest cave system of Turkey. However, when it has been discovered that Pinargözü Cave has a length of 12 km. in 1991, this cave has been placed in the 2nd order. Its siphons, areas of crippling, lakes and funnel of 80 meters are the characteristics, or perhaps the most exciting aspects of the cave. As there is a danger of flood in the rainy periods, the season and the weather forecast should be taken into consideration while entering the cave.