Bulak (Mencilis) Cave, located within the borders of Karabük Central Bulak Village and also bordering the Safranbolu district, is 8 kilometers away from Safranbolu Center. It is located in a deep rocky valley. The mouth of the cave is reached by climbing a ladder with approximately 150 steps on one wall of this valley. The length of the cave is 6052 meters, the height of the last point relative to the entrance is 281 meters, and 400 meters of this distance have been illuminated in a way suitable for walking and a walking track has been built. Consisting of three interconnected floors, this cave has an interesting formation and development feature. At the bottom of the cave, there is a spring and a cave that contributes to Safranbolu's drinking and utility water. Above it, there is a partially completed middle floor with impressive stalactites and stalagmites, columns, wall and curtain dripstones.