The name 'Cehennemağzı' translates literally to 'Mouth of Hell' in Turkish.
Mythological accounts suggest this cave is where the hero Heracles fought the three-headed dog, Cerberus.
The caves were utilized by early Christians as a hidden sanctuary when the religion was suppressed in the region.
The mosaic floors found within the cave complex date back to the late Roman or early Byzantine period.
The site includes a man-made water reservoir that once supported the surrounding ancient settlement.
Ancient writers including Xenophon and Apollonius of Rhodes referenced the cave's location in their geographical accounts.
The site is situated within the historical territory of the ancient city-state Heraclea Pontica, founded by Megarian colonists.
Geologically, the caves formed within the limestone bedrock typical of the Black Sea coastal region.
Cehennemağzı Caves are a complex of three interconnected natural caverns located in Ereğli, Zonguldak, featuring significant archaeological and mythological importance. The site is identified in Greek mythology as the location of the entrance to the underworld where Heracles (Hercules) descended to capture Cerberus. The primary cavern contains early Christian ruins, including remnants of a church with a mosaic floor, indicating its use as a clandestine place of worship during the Roman period. Another section of the cave was historically used as a water cistern for the ancient city of Heraclea Pontica. The site is characterized by stalactite and stalagmite formations, though much of the cave system is modified for visitor access. Excavations at the site have unearthed Byzantine-era architectural fragments and pottery. It remains one of the few sites in Türkiye linking physical cave geography directly to Classical mythological narratives.
The entrance area where natural light contrasts with the dark cave interior, and the preserved mosaic floor remnants.
Wear shoes with excellent grip as the cave paths can be damp and slippery.
Bring a light jacket as the ambient temperature inside the caves is significantly cooler than the exterior.
Ensure your camera has a flash or high-ISO capability for low-light photography.
Do not attempt to enter restricted or unlit tunnel sections for safety reasons.
Closed on Mondays for routine maintenance.
Avoid touching the cave walls or mineral formations to prevent oil transfer and damage.
