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Why did the Caucasus become a gateway for migrations from Central Asia to Southwest Asia?

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Snow-covered peaks and ridges of the Caucasus Mountains in Russia stretch across the landscape under a pale sky. — Caucasus Caucasus Mountains in Russia.

The Caucasus region serves as a critical gateway for migrations between Central and Southwest Asia primarily due to its geography as an isthmus separating the Black Sea and the Caspian Sea.2

Specifically, the road passing along the shores of the Caspian Sea has historically functioned as one of the primary routes for nomadic peoples moving from Central Asia toward Southwest Asia. Because of this strategic position, the Caucasus has served as a major transit corridor throughout history, facilitating the movement of various groups across Eurasia.12

Beyond its role as a migration route, the region’s rugged terrain has also allowed it to function as an "ethnic museum," where groups passing through the area have settled in remote mountain pockets, particularly in Dagestan. Furthermore, the region has historically acted as a buffer zone between competing empires, including Roman, Parthian, Byzantine, Arab, Ottoman, Persian, and Russian powers.1