Phanagoria

Phanagoria, located in the Taman peninsula, was the largest Ancient Greek city. Stretching over two plateaus on the Asian shore of the Cimmerian Bosporus, it was a heavy traffic town. Renowned, by many for its trade, it is now located to the west if the Sannoy in Kranodar, Krai, Russia.
This Post Belongs To Mysterious Underwater Cities