To the north of mountains of Southern Siberia (Sayans) places Central-Siberian plateau, passing in North-Siberian lowland and further in Byrranga mountains.
South of Central Siberia represents a combination of raised lands and depressions.
On northeast it is limited by Western outskirts of Lena-Angarsky plateau, on the north and northwest - southern extremity of Angarsky mountain-ridge.
Siberia is bounded on the west by the Ural Mountains; on the north by the Arctic Ocean; on the east by the Pacific Ocean and the Bering Strait; and on the south by China, Mongolia, and the hills of north central Kazakhstan.
Between the Yenisey and Lena rivers lies the CentralSiberianPlateau, with elevations ranging between 300 and 1200 m (1000 and 4000 ft).
In Tomsk, in the West Siberian Plain, the average temperature in January is -21° C (-6° F), and the average temperature in July is 18° C (64° F).