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In geopolitics literature, small and low-endowment states that compound lesser geopolitical potentiality and weight are considered as the trivial scale agents in comparison with the first and second level powers. These agents, in spite of the local geopolitical codes but sometimes can effect on the regional and even global events of geopolitics. The Caucasian region, historically, have had a field for appearance and exposition of sub-khans that their overall actions and agencies effected the events of the region and due to its cultural proximities to Iran, have effected in Iran’s geopolitical functions in national scale. The present paper with descriptive-analytical method, have studied historical role of the local agencies in geopolitical events of the Caucasia and their impression on the great scale events. Secondly, the paper has studied the quality of the chosen countries of the region in current circumstances of the global system. Results indicate that the Caucasian countries act according to their historical legacy as a small-scale agents among the great scale actors.

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Security complex represents a unique group of countries where the process of "security building" and "making insecure" or both for this group of countries are increasingly related with each other. In other words, their main security concern is so intertwined that their security problems cannot be solved independently. Thus conceived, "hydropolitic complexes" include those countries which are geographically the owner and from technical point of view, are the user of part of the shared river. In fact, a group of the countries which are considered to be part of a region due to their water resources (rivers, lakes and aquifers), would have no common geographical borders but their "national security" and "hydropolitic security" are so interrelated that their security and hydropolitc problems cannot be resolved without their cooperation. The methodology of current descriptive-analytic study focused on Mesopotamia and Hirmand drainage basins (in parts of Iran), is grounded on the hypothesis that in a hydropolitic complex in the same way that the threatening of water security of each one of the member states might lead to the threatening of national security of other members, some threats can be posed against the water security of each one of the member states due to the threatening of the national security of other members. The data required for this research have been collected using library sources (books, journals and internet). The results of this study showed that how hydropolitic security is endangered following the eruption of insecurity in Afghanistan. At Tigris and Euphrates Basin, the climate changes and Turkey's inattention to hydropolitic security of Syria (by closing the floodgates of the dams) provided the ground for the emergence of internal crisis in Syria, and its reverberations posed serious threats against the security of Turkey, Iraq and Iran.

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Water diplomacy, as one of the effective tools in the management of shared water resources—particularly in regions with transboundary rivers—plays a crucial role in reducing tensions and strengthening regional cooperation. This study, employing an applied approach and a descriptive–analytical method, provides a geopolitical analysis of water diplomacy in Iran’s border rivers. To better conceptualize the issue, three converging theoretical frameworks in international relations—neoliberal institutionalism, liberalism, and constructivism—are utilized. Accordingly, the main research question explores how these theoretical approaches can contribute to an effective analysis of water diplomacy in Iran’s transboundary river basins. The central hypothesis posits that an integrative application of these theories can lead to a more accurate understanding of geopolitical relations, reduction of regional tensions, and enhancement of cooperation mechanisms between Iran and neighboring countries in managing shared water resources. The findings—drawn from the application of these approaches to three case studies (Helmand, Harirud, and Aras rivers)—indicate that despite their theoretical differences, all three frameworks emphasize institutional capacity building, economic interdependence, and the formation of shared identities and norms. These elements, in turn, can provide a solid foundation for enhancing water diplomacy across Iran’s borders. The study also highlights that adopting a synthesized approach can significantly assist policymakers in formulating comprehensive and multi-dimensional strategies for the sustainable management of transboundary water resources.

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One of the problems in analyzing hydro-political relations in the system of international rivers is that the same factors can create a wide range of conflict or cooperation, and even an identical variable may play a different role in relation to other variables in each coastal country; Therefore, the recognition of the variables and the role that each variable has in developing a pattern of analysis of opportunities and risks for countries that share transboundary waters with other countries is essential. Iran is in the Harirud basin shared with Afghanistan. The presence of this basin in a dry and semi-arid strip of world has caused Iran's dependence on the water of Harirud to provide water to the east and northwest, and especially to the metropolis of Mashhad. Therefore, the research question is: What are the variables and indicators effective on the Strategic Importance of Harirud for Iran? For this purpose, 86 indicators were identified using library and field studies and categorized in geographical-geopolitical, technical-economical, and political-social variables in expert meetings with experts. After identifying the most important variables using the Delphi method, the role of each variable in the structural analysis of the variables has been investigated with the help of the Micmac software. The results indicate that geopolitical -geographical variables are the most effective and Most impressive variables, and indicators of the importance of Harirud for drinking water, food security, security of water resources and Afghanistan's position in Iran's foreign policy, strategic indicators for the importance of Heriud for Iran.

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