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In page Siberia:

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During past millennia, different groups of nomads – such as the Enets, the Nenets, the Huns, the Xiongnu, the Scythians, and the Yugur – inhabited various parts of Siberia. The Afanasievo and Tashtyk cultures of the Yenisey valley and Altay Mountains are associated with the Indo-European migrations across Eurasia.[1] The proto-Mongol Khitan people also occupied parts of the region.[citation needed]