Located along Türkiye’s Mediterranean coast, Mersin Province is one of the country’s most fascinating destinations for underground exploration. Beneath the rugged landscapes of the Taurus Mountains and the Mediterranean coastline lies an extraordinary world of limestone caves, deep sinkholes, underground rivers, and hidden chambers shaped over millions of years.

Thanks to its extensive limestone geology, Mersin has developed a remarkable karst landscape filled with natural formations and archaeological treasures. Many caves in the region contain impressive stalactites and stalagmites, while others preserve traces of ancient civilizations that once inhabited the Mediterranean coast.

Among Mersin’s most famous underground attractions are the spectacular Gilindire (Aynalıgöl) Cave, known for its crystal-clear underground lake, and the legendary Cennet-Cehennem (Heaven and Hell) Sinkholes, which combine dramatic natural scenery with ancient mythology and history.

Gilindire (Aynalıgöl) Cave

Located near Aydıncık District, approximately 7 kilometers from the town center, Gilindire Cave is considered one of Türkiye’s most impressive show caves. Discovered by a shepherd in 1999, the cave quickly gained international attention due to its extraordinary underground formations and unique lake.

The cave extends for approximately 555 meters, descending through a series of chambers decorated with spectacular mineral formations.

Its greatest attraction is the magnificent Aynalıgöl (Mirror Lake), a subterranean lake whose calm surface creates a perfect reflection of the cave ceiling and formations. The crystal-clear water gives the impression of a giant underground mirror, creating one of the most unforgettable cave landscapes in Türkiye.

Highlights of Gilindire Cave

Underground mirror lake
Thousands of stalactites and stalagmites
Natural columns and curtains
Crystal formations
Modern visitor facilities
Stunning photography opportunities

The cave maintains a stable temperature and humidity throughout the year, allowing visitors to explore comfortably even during the hot Mediterranean summer.

Cennet-Cehennem Sinkholes (Heaven and Hell)

Located near Silifke, close to the ancient city of Korykos (Kızkalesi), the Cennet and Cehennem sinkholes are among Mersin’s most iconic natural landmarks.

Created by underground water erosion and the collapse of limestone caverns, these enormous depressions combine dramatic geology, mythology, and ancient history.

Cennet Sinkhole (Heaven)

Cennet is the larger and more accessible of the two formations. The enormous green depression stretches approximately 250 meters long and 70 meters deep, creating a spectacular natural amphitheater surrounded by vegetation.

A staircase leads visitors down into the sinkhole, where they can explore:

Ancient pathways
Natural vegetation
Rock formations
The remains of a historic monastery

At the bottom stands the remains of a small Byzantine-era church dedicated to the Virgin Mary, adding historical significance to this extraordinary geological site.

According to Greek mythology, Zeus imprisoned the monster Typhon beneath Mount Etna after defeating it in battle. Local legends connected the region’s deep caves and underground passages with this mythical underworld.

Cehennem Sinkhole (Hell)

Located beside Cennet, Cehennem is a much deeper and more dramatic vertical collapse.

Unlike Cennet, visitors cannot descend into the bottom due to its steep walls. Instead, viewing platforms allow visitors to admire the enormous natural pit from above.

Its name comes from ancient mythology and its mysterious, inaccessible appearance.

Highlights

Dramatic limestone formation
Deep vertical walls
Panoramic viewpoints
Mythological connections

Astım Cave (Dilek Cave)

Located near the Cennet-Cehennem sinkholes, Astım Cave is another popular underground attraction.

The cave is named after the belief that its humid and mineral-rich air may benefit people suffering from respiratory problems. While these traditional beliefs remain popular among visitors, medical claims should be evaluated by healthcare professionals.

The cave features:

Narrow passages
Beautiful stalactites
Stalagmites
Natural rock formations
Cool underground atmosphere

Köşekbükü Cave

Located near Anamur, Köşekbükü Cave is one of Mersin’s notable natural caves. The cave is famous for its impressive formations and its association with traditional health tourism.

Local legends describe the cave as a place where people sought relief from respiratory illnesses due to its constant temperature and humidity.

Visitors can explore chambers filled with:

Limestone formations
Rock curtains
Mineral deposits
Natural galleries

Narlıkuyu Caves and Coastal Caverns

The coastline around Narlıkuyu, Kızkalesi, and Silifke contains numerous smaller caves and marine caverns formed by the interaction between limestone cliffs and the Mediterranean Sea.

These coastal formations can often be explored through:

Boat tours
Swimming excursions
Diving trips
Sea kayaking

The combination of turquoise waters, cliffs, and hidden caves creates some of the most beautiful scenery along the Mersin coastline.

Archaeological Importance of Mersin’s Caves

Mersin’s caves are not only natural wonders but also important archaeological sites. The region has been inhabited for thousands of years due to its fertile lands, strategic location, and access to the Mediterranean.

Caves and rock shelters have revealed evidence from different periods, including:

Prehistoric settlements
Roman remains
Byzantine religious structures
Ancient burial practices
Early human activity

The caves provide valuable information about the relationship between humans and the environment throughout history.

Geological Formation of Mersin’s Underground World

The Taurus Mountains around Mersin consist largely of limestone formations. Over millions of years, underground water gradually dissolved these rocks, creating extensive cave systems and sinkholes.

This geological process produced:

Underground lakes
Vertical shafts
Caverns
Natural bridges
Water channels
Stalactites and stalagmites

The region continues to evolve naturally as water flows through underground networks.

Best Time to Visit Mersin’s Caves

Mersin’s caves can generally be visited throughout the year, but the best periods are:

Spring (April–June)

Pleasant temperatures
Ideal for hiking
Green landscapes

Autumn (September–November)

Comfortable weather
Fewer crowds

Summer (July–August)

Excellent escape from Mediterranean heat
Caves provide naturally cool environments

Travel Tips

Wear comfortable walking shoes, especially for sinkholes and uneven cave paths.
Bring a light jacket because underground temperatures are cooler.
Be careful on stairs and wet surfaces.
Respect archaeological remains and natural formations.
Avoid touching stalactites and stalagmites.
Combine cave visits with nearby attractions such as Kızkalesi, ancient cities, beaches, and coastal villages.

Why Explore Mersin’s Caves and Sinkholes?

The underground landscapes of Mersin offer one of the most extraordinary combinations of nature, mythology, and history in Türkiye. From the magical reflections of Gilindire Cave’s Aynalıgöl to the legendary depths of Cennet-Cehennem, these formations reveal a hidden world beneath the Mediterranean coast.

For travelers interested in geology, archaeology, adventure, and cultural heritage, Mersin’s caves provide a unique journey into the ancient forces that shaped both the landscape and the civilizations that flourished around it.

Caves and Sinkholes of Mersin: Exploring Turkiye’s Underground Wonders