Indo-European languages are believed to have spread from herding peoples originally from this region:

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The Pontic Steppe, also known as the Eurasian Steppe, is a vast region stretching from modern-day Ukraine and Russia to parts of Central Asia. It is believed that the herding peoples of this region, specifically the Yamnaya culture, were the bearers of the Proto-Indo-European language, which eventually spread and diverged into numerous Indo-European languages spoken today.

Indo-European Languages Are Believed to Have Spread from Herding Peoples