The Volga region, known as the Povolzhye (UK: /pəˈvɔːlʒeɪ/ pə-VAWL-zhay, US: /pəˈvoʊlʒeɪ/ pə-VOHL-zhay; Russian: Поволжье [pɐˈvoɫʐje] lit. 'Along the Volga'), is a historical region in Russia that encompasses the drainage basin of the Volga River, the longest river in Europe, in central and southern European Russia.
The Volga region is culturally separated into three sections:
The Pontic–Caspian Steppe is a steppe extending across Eastern Europe to Central Asia, formed by the Caspian and Pontic steppes. It stretches from the northern shores of the Black Sea (the Pontus Euxinus of antiquity) to the northern area around the Caspian Sea, where it ends at the Ural-Caspian narrowing, which joins it with the Kazakh Steppe in Central Asia, making it a part of the larger Eurasian Steppe. Geopolitically, the Pontic–Caspian Steppe extends from northeastern Bulgaria and southeastern Romania through Moldova, southern and eastern Ukraine, through the North Caucasus of southern Russia, and into the Lower Volga region where it straddles the border of southern Russia and western Kazakhstan. Biogeographically, it is a part of the Palearctic realm, and of the temperate grasslands, savannas, and shrublands biome.
The area corresponds to Cimmeria, Scythia, and Sarmatia of classical antiquity. Across several millennia, numerous tribes of nomadic horsemen used the steppe; many of them went on to conquer lands in the settled regions of Central and Eastern Europe, West Asia, and South Asia.
The Proto-Indo-Europeans are a postulated prehistoric ethnolinguistic group of Eurasia who spoke Proto-Indo-European (PIE), the reconstructed common ancestor of the Indo-European language family.
Knowledge of them comes chiefly from that linguistic reconstruction, along with material evidence from archaeology and archaeogenetics. The Proto-Indo-Europeans likely lived during the Late Neolithic period (6400 to 3500 BC). Mainstream scholars place them in the Pontic–Caspian steppe across Eurasia (this steppe extends from northeastern Bulgaria and southeastern Romania, through Moldova, and southern and eastern Ukraine, through the Northern Caucasus of southern Russia, and into the Lower Volga region of western Kazakhstan, adjacent to the Kazakh steppe to the east, both forming part of the larger Eurasian Steppe). Some archaeologists would extend the time depth of PIE to the Middle Neolithic period (5500 to 4500 BC) or even the Early Neolithic period (7500 to 5500 BC) and suggest alternative origin hypotheses.