The early Slavs came from Indo-European lands, spreading from various parts of Asia into Eastern Europe about 2000 BC. Under the pressure of nomadic hordes, the Slavic tribes crossed the Carpathian Mountains and pushed their way down to the Balkans. Others moved westward toward the upper Danube, and still others eastward toward the River Dniper and Black Sea. This migration continued from the fourth through the eighth century, giving birth to the Slavic nations that we know today.