Katavothres is called the geological phenomenon where seawater penetrates slots on land. The Kefalonian sinks are one of its many rare geological phenomena, as they are under the surface of the water, forming a species of sea bark. Moreover, the incoming water crosses the entire island from west to east, and after covering a distance of about 15 km and mixing with the rainwater, it balances the Melissani cave and Karavomylos in the area of ??Sami.

The existence of groundwater in Kefalonia is due to its location, where the tectonic plates of the earth are joined together.

In 1835 Stevens, an Englishman who lived in Kefalonia, built watermills there, to exploit the momentum of water to grind corn. The earthquakes of 1953 destroyed the mills and in their place was constructed the one we see today.

On the road from Argostoli to Katavothres and the Lighthouse of Agioi Theodoroi, you will cross Thalassomylos, where, apart from its traditional buildings that later got renovated and was operating for several years as a restaurant, you will also see a similar marine mill. Today in Katavothres you can also enjoy your view of Palliki, Vardiani and the Ionian with your coffee and if you are lucky, dolphin games are open!