The Cave of the Seal is one of the purest and most pristine places in Corinth and has remained unknown for years due to its difficulty of access.
You can get there by boat or by a dirt road and descend 100 meters.
The cave has one hidden sandy beach, to which you can only access by walking in the water.
What makes this place special, besides the 20-meter arch is that the beach inside the cave never has direct sunlight.