Europe’s eastern frontier was defined in the 1st century by geographer Strabo at the River Don. The Book of Jubilees described the continents as the lands given by Noah to his three sons; Europe was defined as stretching from the Pillars of Hercules at the Strait of Gibraltar, separating it from Northwest Africa, to the Don, separating it from Asia.
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The convention received by the Middle Ages and surviving into modern usage is that of the Roman era used by Roman era authors such as Posidonius, Strabo and Ptolemy, who took the Tanais (the modern Don River) as the boundary.
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