India then being four-sided in plan, the side which looks to the Orient and that to the South, the Great Sea compasseth; that towards the Arctic is divided by the mountain chain of Hmdus from Scythia, inhabited by that tribe of Scythians who are called Sakai; and on the fourth side, turned towards the West, the Indus marks the boundary, the biggest or nearly so of all rivers after the Nile.
Megasthenes