One of the most astonishing geological phenomena which is unique for the Island of Kefalonia, is the hydrological karstic system, which connects the sinkholes of Argostoli with the brackish springs of Sami-Karavomilos, with an inflow speed up to 3 m / sec. They constitute an underground karstic system of conduits and cavities, which develop in the limestones of mount Aenos. Source: (www.kefaloniageopark.gr)