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The demarcation of international borders is an essential issue. Although this can manage between neighboring countries, sometimes disputes may lead to many wars and problems. However, this can be solved officially by negotiation between the two sides; the actual solution required the determination of the exact borderline with pillars' positions. Consequently, a series of positioning computations are required, followed by field works to fixing these locations practically. This procedure can be achieved efficiently by geomatics techniques. This paper analyses the delimitation of the Iraq-Iran borders according to the 1975 Treaty. To highlight the borders demarcation problems and their solutions, the case study is the Shalamcha Border crossing area at Basrah, south of Iraq. In this area, a new proposed railroad connects the two countries, which required identifying the exact locations of borderline and frontiers pillars. The available data were extracted by modern geomatics techniques based on aerial photos taken in 1975 and approval maps of the Treaty. Thus, digital aerial triangulation was used (i.e. Bundle Adjustment based on Leica photogrammetry system) to produce orthorectified images. The derived positions on these images were checked by the observations of the Global Navigation Satellite System (GNSS). The final results show differences between the existing borderline and the derived one. This means that the positions of existing borderline and marker pillars do not match the delimitation in the 1975 Treaty. Consequently, there is a 220m of Iranian overstepping towards Iraq, which means the existing borderline required shifting and reconsideration in the railroad locations at border crossing points. Finally, the whole borderline is required checking and re- demarcations. [ABSTRACT FROM AUTHOR]