Constructing a defence line: The functional transformation of Evros/Meriç river

In recent years, the most dramatic episodes of the Greek-Turkish conflict have been taking place in the Aegean Sea and the Mediterranean. In addition to the maritime frontier, a tense situation has emerged along the Evros/Meriç River, which currently serves as an artificially constructed defence line. This paper seeks to understand how the defensive role has emerged and how it achieved stability through nationalist policies, bilateral conflicts, and European encouragement. The study employs the constructivist theory of international relations to unfold the question which provides a theoretical background and methodological framework for analysing historical periods and related transformations. The paper argues that the river did not originally serve as a natural border but has taken on a “borderized” nature, a highly protected defence line which undermines the development of the whole Thracian region.