Eurasia Turkish Straits Black Sea Kerch Strait Sea of Azov Don Tanais continent Asia Ptolemy Middle Ages continents
Throughout the Middle Ages and into the 18th century, the traditional division of the landmass of Eurasia into two continents, Europe and Asia, followed Ptolemy, with the boundary following the Turkish Straits, the Black Sea, the Kerch Strait, the Sea of Azov and the Don (ancient Tanais).