”Cennet Cehennem” in Mersin province.
3km away from Narlıkuyu Turks call these big grottoes Heaven and Hell. They were caused by the constant action of water and the caving in of the eroded limestone rock.

The bigger grotto (cennet-heaven) is 70m deep, 90m wide and 200m long, and it has certain similarities to a stalactite cavern. On the southernmost part of the chasm was once a huge rock-vault early Christian church of the Virgin Mary. The smaller higher grotto (cehennem-hell) is several metres to the north of the larger one.

Its diameter is 50m. It is veiy dangerous because its rim curves inwards. The grotto took its name “cehennem-hell” from having air which is low in oxygen.