Poseidon's Spear

After this he proceeds to determine the breadth of the habitable earth: he tells us, that measuring from the meridian of Meroe to Alexandria, there are 10,000 stadia. From thence to the Hellespont about 8100. Again; from thence to the Dnieper, 5000; and thence to the parallel of Thule, which Pytheas says is six days’ sail north from Britain, and near the Frozen Sea, other 11,500. To which if we add 3400 stadia above Meroe in order to include the Island of the Egyptians, the Cinnamon country, and Taprobane, there will be in all 38,000 stadia.

Strabo, Geography 1.4