Bulak cavern, also known as Mencilis cavern, is located in a valley on the border of Safranbolu and Bulak Village. One of the natural beauties of Karabük, Bulak cavern is said to be one of the longest discovered caverns in Turkey. The length of the cavern is about 6 km, but 400 meters of it is illuminated suitable for walking. The cavern, which took its present form 3 million years ago, is easy and enjoyable to visit.

It is a natural wonder formed due to karst melting. When you enter, a mystical atmosphere surrounds you. Bulak cavern, which is one of the hidden beauties of Anatolia with its stalactites and stalagmites formed from karst rocks over millions of years, is only eight kilometers away from the town center of Safranbolu.

Consisting of three interconnected floors, this cavern has an interesting formation and development feature. At the bottom of the cavern is the spring and cavern that contributes to the drinking water of Safranbolu, and above it, there is a partially completed middle floor, which has beautiful stalactites and stalagmites, columns, wall and curtain dripstones. The natural beauty of the cavern and its surroundings and preserved authentic structures make the region touristic.

The mouth of the Bulak cavern, located in a deep rocky valley, can be reached by climbing a ladder with approximately 150 steps on one wall of this valley. At the end of the corridor, which winds 20-30 meters from the entrance, which is reached by stairs, the ceiling of the cavern suddenly rises by 20 meters.

At this point, a magnificent view welcomes you. The different types of stalactites the cavern has stand side by side with their rough and flat surfaces turning from white to brown. You have to move forward by climbing the metal steps in a few places.

There is a waterfall and two separate lakes ahead of the cavern, which has 3 interconnected entrances. Although the underground river flowing inside the cavern is not open to visitors, it falls from a 15-meter waterfall and forms a small lake. The water mixed with the underground rises to the surface and reaches the village of Bulak and the center of Safranbolu.

400 meters of the cavern is illuminated suitable for sightseeing. In the cavern where walking tracks are built, a humid air prevails due to the water dripping from the walls. The cavern, which has a constant temperature of 15 degrees in all four seasons of the year, is said to be good for diseases such as shortness of breath, asthma and bronchitis.

How to get to Bulak Mencilis cavern
Bulak cavern is located on the border of Bulak Village of Safranbolu district of Karabük. Located ten kilometers north-west of Safranbolu, at the starting point of Manastır Tepe and cavern Creek, the cavern is 8 kilometers from Safranbolu town centre. Transportation can be provided by buses departing from the Old Bazaar every day.
The asphalt road you follow by following the signs in the center provides access to the stairs leading to the cavern entrance. However, after 100 meters of getting off the vehicle and walking for 50 meters, you are on the stairs leading to the entrance of the cavern. There is also a small cafe on the cavern road, with a very nice view