This article examines the dynamics of the process of geographical perception of Siberia, in the aspect of the forming of the idea of Siberia as geographical and cultural unity. There are presented, in particular, quite legendary testimonies of foreign travelers who almost up to the end of the 17th century were getting pretty random information from Russian merchants; some data from the proper Siberian Chronicles is also given. Taking into account the idea of empire as a political structure that prevailed in the last 2,500 years of human history, author deals with the cultural and political factors which has determined the integrity of the idea of Siberia as a specific megaregion. Particularly the question of the nature of the development of Siberia in terms of the corresponding type of colonization is examined. It is concluded that the population of Siberia, despite the fact that it was used and even became in the first place famous as a region of exile, the consciousness of Siberians is not typical for colonial territory. Since the end of the 18th century the representation of a Siberian as a special group of the Russian population is firmly established.