The Chapter is devoted to different aspects of interethnic communications. Various factors are estimated, and it revealed the specificity of interethnic connection and ethno-cultural transformation of Siberian people. Modern ethno-cultural space is transformed primarily under the influence of migration. However, ethnic composition is changing, and new ethno-cultural characteristics are emerging. Historical, geopolitical, psychological and economic factors influence the speed of transformation. One of the most important, given few attentions in the geographical literature, is the ethnic division of labour (EDL). In this chapter authors considered the geographical aspects of the ethno-cultural trans-border regions and ethno-contact zones. It analysed the definition of ethno-contact and their typology. One of the examples, markers and at the same time the results of interethnic contacts is borrowed geographical vocabulary. In the Siberian region the relation of ethno-cultural and regional identity of the population is defined in the structure of diversification of spatial-hierarchical levels of society’ territorial organization. In Siberia ethno-cultural identity itself is considered as a function of ethno-mentality.