A: İstanbul, Turkey, B: Loutraki, Greece
The Greeks invented the two main components of watermills, the waterwheel and toothed gearing, and were, along with the Romans, the first to operate undershot, overshot and breastshot waterwheel mills.
The earliest evidence of a water-driven wheel is probably the Perachora wheel excavated from Perachora, an inland settlement in the Loutraki-Perachoras municipality of the Corinthia prefecture in the periphery of Peloponnese in Greece. The earliest written reference to a water-driven wheel is in the technical treatises Pneumatica and Parasceuastica of the Greek engineer Philo of Byzantium (Φίλων ὁ Βυζάντιος).