Since 1970, Turkey has started a series of dams under the name of GAP project during six pe-riods with the aim of developing its southeast regions. This plan has reduced the water re-sources coming out of Turkey and has had destructive consequences on the ecosystem of the countries that are in the path of the said water resources and has caused environmental, eco-nomic and social damages. Although Iran is not directly in the path of the outgoing waters, it has faced such threats as a result. Using the descriptive-analytical method and library and me-dia sources, this research is looking for an answer to this question: How will Turkey's GAP plan cause a big crisis in the region? With the completion of Turkey's GAP project and the continuation of this situation, the consequences of this mega-project under the title of five threats to security (environmental, social, economic, political and military) from the perspec-tive of the Copenhagen School of Security Studies have caused the following and threaten the lives of the people of the region. The drying up of the downstream rivers, floods, intensifica-tion and increase of the micro dust center, lack of water, unemployment, outbreak of disease, deepening of social damage, migration, damage to historical monuments, etc. The findings show that by implementing the GAP project, Turkey has turned water into a pressure lever in the country's foreign policy and one of the main factors of geopolitics and strategy in the Middle East. And contrary to their claims, this project is not in line with sustainable economic development and has caused threats and consequences in the countries affected by the project.
