Geopolitical Influential Domains in Development and Security in the Southeastern Region of the Islamic Republic of Iran

 The southeastern region of the Islamic Republic of Iran, due to its extensive land and water borders and proximity to international routes, is considered one of the country's geopolitical focal points. However, this region has always faced challenges such as underdeveloped infrastructure, economic inequality, social gaps, and border insecurity. Historical experience and theoretical studies have shown that achieving sustainable development in border areas requires a deep understanding of geopolitical factors; because what the region possesses (geographical location, natural resources, transit corridors) can become a source of threat if not accompanied by security coordination and effective governance. This research aims to identify and analyze the geopolitical factors affecting comprehensive development and sustainable security in southeastern Iran. The research approach is qualitative, and the method is descriptive-analytical based on the study of documents, articles, official reports, and note-taking. The spatial scope of the research includes the land and water borders of the Islamic Republic of Iran in Sistan and Baluchestan province. Content analysis of the data shows. Components such as geopolitical situation (access to open waters), geo-economic (access to the North-South Corridor, mineral resources, renewable energy), socio-cultural cohesion (ethnic diversity, local participation), security component (smuggling, terrorist groups), and regional relations and foreign policy (border interaction, regional transit agreements) were identified as key determinants of influence. The findings indicate that the interaction between these components, especially the integration of development and security, is vital for ensuring sustainable security and regional growth, so that the weakness of each of them can be a deterrent factor in the path of development and stability. Based on the results, it is suggested that regional and national policymakers design convergent security and development plans to optimize the geopolitical capacity of the southeast region and reduce security barriers.