Liudmila Baeva, Anna Romanova
This contribution is devoted to frontier theory, the analysis of its conceptual apparatus as well as its topical issues and practical application. We propose a revision of this theory, and confront the usefulness of the term “frontier” with other the similar concepts such as border, boundary and limit. The paper also proposes a typology of frontiers characterized by various aspects; civilization, intercultural, religious, and anthropological, among other. From the standpoint of this discussion, the authors consider the Southern Russian bordering region of the Caspian Sea, today a much conflicted territory.