The unresolved delimitation of the Kyrgyz-Tajik border has incited recurring and increasing violent outbreaks among border communities especially in recent years. Disputes usually involve land allocation and resources distribution, namely access to water, pasture as well as the right of way, the former two intensifying with increasing resource scarcity due to climate change.

This paper investigates the legal situation of disputed border sections between Kyrgyzstan and Tajikistan, with a focus on the Batken/Isfara region, more specifically the contentious areas of the Isfara Valley and the Vorukh enclave, a hotspot of violent clashes. Being of strategic importance the valley is one of the main issues why talks on border delimitation have stagnated.

First, the conflicting territorial claims and origins of disputes are examined on the basis of official statements, government reports as well as Kyrgyz and Tajik newspaper articles. After considering the theoretical and legal framework applicable to international territorial disputes, an assessment of the claims is made. Employing a thorough analysis of historical documents, maps and international legal frameworks, the study examines the territorial claims and legal standings of both nations. The ambiguous and unresolved border delineation trace back to the Soviet era with the '1958 agreement at the centera commission's decision that favoured Kyrgyz SSR by adjusting the de jure situation to reflect actual land use. The decision was ratified by the Kyrgyz SSR, but the consent of the Tajik SSR is contentious, which has led to today's dispute over the legitimacy of the 1958 demarcation under the Soviet legal framework in place at the time.

The findings highlight the inherent challenges posed by the uti possidetis principle, which, while providing legal stability, does not fully address the complexities of pre-existing conflicts. The enduring discrepancy between de facto and initial de jure situations, deeply rooted historical claims, and the strategic significance of the contested areas pose significant hurdles to achieving a lasting resolution to the Kyrgyz-Tajik border dispute. The case offers broader insights into the challenges of border delimitation in post-Soviet states.