Borders are a complex social phenomenon associated with the foundations of the territorial organization of society and human psychology. Geographers are the ones who have begun to study the borders of the state. The history of mankind is largely a history of wars, and the ultimate goal of most of these wars was the change of borders. The title of a famous book of French geographer and geopolitician Yves Lacoste sounds symbolically “Geography is used first to make war.” Governments and decision-makers must justify territorial claims and annexes, and redesigning borders has given rise to the need for applied research on delimitation and their delimitation. Particular attention is paid to the frontiers in the so-called new political geography, which emerged in the mid- ‘70s, following the renovation of the theoretical framework, by using more rigorous scientific approaches and by strengthening links with other social sciences. Today, borders are widely recognized as complex and multilateral social phenomena linked to the fundamental organization of society as well as human psychology. This has not always been the case, but the way the frontiers were seen and interpreted evolved - much in line with wider discursive changes in social sciences, as well as overlapping geopolitical events.