an ancient area of Eurasia extending from the Black Sea to the Aral Sea that was populated by Scythians from the eighth to the fourth century BC

In Classical Antiquity, Scythia (Greek Skuthia) was the area in Eurasia inhabited by the Scythians, from the 8th century BC to the 2nd century AD. Its location and extent varied over time but usually reached broader west as on the map here.