What is the water barrier between Europe and Asia?

what is the natural water barrier that lies between the continents of Europe and Asia?

The Caspian Sea and the Black Sea both.

There is no water barrier between Asia and Europe.

The Bosporus Straight...

Caucasian Mountains

Europe is the extension of Asia.Yet Europeans consider themselves 'different'.

i think there's no water barrier between Europe and Asia.The land barrier between them is the Ural mountain.

There are actually 5 bodies of water that amoung the so called adopted boundry. The Artic Ocean, Zhem River, Caspian Sea, Sea of Azov, and the Kerch Strait. This line runs south from the Artic Ocean then southwest from the Zhem River to the Kerch Strait.

Europe and Asia are seperated on a cultural basis rather than a physical differentiation. Some experts consider europe and asia to be a same continent called eurasia .