ABSTRACT
SIBERIA occupies a vast area in Northern Asia and forms altogether about a quarter of the whole continent. I propose to include in this term what is usually known as the great Siberian plain, which stretches from Turania and the Urals to the Behring Strait. It forms a triangle; the apex is situated near the mouth of the River Obi and one angle is near the Aral Sea and the other at the Behring Sea. It is bounded on the north by the Arctic Ocean, on the west by the Ural Mountains, and on the south by a series of great mountain ranges, in which the head-waters of the great rivers, the Obi, the Yenesei, and the Lena, are situated. These frontiers make it very difficult of access.
