Europe and Asia were originally a continent called Eurasia. Eurasia is divided into two continents, Europe and Asia. In modern geography, the dividing line between Europe and Asia is the long line of Urals Mountains, ural river, Caspian Sea, Caucasus Mountains, Black Sea, Bosporus Strait, Marmarakhi and Da Daniil Strait.

The dividing line of seven continents is the dividing line of seven continents. The seven continents include Asia, Europe, Africa, Oceania, North America, South America and Antarctica. For example, the borders between Asia and Europe are the Urals, ural river, the Caspian Sea, the Caucasus, the Black Sea and the Turkish Strait.