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This chapter introduces the Caucasus as a geographic entity and its placement relative to the Greater and the Lesser Caucasus mountain ranges. It discusses the impact of the region’s terrain on human settlement and community isolation; the tectonic-geophysical formation of the Caucasus Mountains; the diverse physical environments of the Caucasus region; the region as a frontier zone and biogeographic barrier; early hominoid presence in the Caucasus; the history of glaciation and the possibility for population refugia throughout the Last Glacial Maximum, and the Manych-Kerch Spillway.
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