The holes of the Argostoli sink are still considered a mystery and are part of a rare geological phenomenon in Kefalonia. Katavothres is located 3 km outside of Argostoli and you definitely don’t to be missed.The occurrence was unusual enough in 1835 that the English erected grain mills, and despite earthquakes breaking the water wheel, nothing changed the pattern of water coming in and leaving beneath.One could wonder where the wheel was set up to function.They need running water.The unusual geological formations came into play at this point.At Katavothres, the sea rushes inland and into below-sea-level sinkholes.Water is said to flow into caves beneath the seafloor.In these holes, mills used to operate.The water would rush down the man-made channels, and the wheel would begin to turn.In 1963, Austrian geomorphologists dyed the water purple and tracked its path, only to make some unexpected discoveries.The water traveled through underground rivers, mingled with precipitation, and eventually reached the Melissani Lake in a semi-salted state, about fifteen kilometers distant.From there, the water poured into the sea near Karavomilos settlement. The purple water travelled two weeks to make this trip across the island.The cause of the phenomena is yet unknown.There are many hypotheses floating about, but none of them can be proven beyond a shadow of a doubt.It’s a fantastic idea to travel to Katavothres, take in the beautiful sights, and leave the questions to nature.