Aral-Caspian depression to the lowlands of the Tobol, Irtysh and Ob, and thence towards the lower parts of the Yenisei and the Lena.
The chief grain-producing regions of Siberia are - the Tobol and Ishim region, the Baraba, the region about Tomsk and the outskirts of the Altai.
Next year they were on the Tobol, and 500 men successfully laid siege to Isker, the residence of Khan Kuchum, in the neighbourhood of what is now Tobolsk.
From this region started an important trade route eastward by the Thyssagetae among the southern Urals, the Iyrcae on the Tobol and Irtysh to the Kirgiz steppe, where dwelt other Scyths, regarded as colonists of those in Europe: then by the Argippaei in the Altai and the Issedones in the Tarym basin, to the one-eyed Arimaspi on the borders of China, who stole their gold from the watchful griffins, and who marched with goat-footed men and Hyperboreans reaching to the sea.
22) beyond the Thyssagetae, somewhere about the upper basins of the Tobol and the Irtysh.