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How did mountain ravines help preserve small ethnic groups in the Caucasus?

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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 has a long history of invasions by various peoples, including the Scythians, Huns, Mongols, and forces from rival empires like the Ottoman and Persian states. Throughout these periods of conflict, the rugged geography of the Caucasus Mountains provided a natural defense for the region's inhabitants.12

Under pressure from stronger neighbors, individual ethnic groups frequently retreated into the remote ravines of the mountain ranges. These isolated, difficult-to-access areas allowed these groups to maintain their independence and preserve their distinct cultures, languages, and social structures away from the reach of invading forces.13

Because of this protective topography, the Caucasus has functioned as an "ethnic museum," harboring a vast diversity of more than 50 separate peoples—some numbering in the millions and others consisting of small communities with only a few hundred speakers. This geographic fragmentation is a primary reason why the region remains one of the most linguistically and ethnically diverse areas in the world.32