The 1982 Convention on the Law of the Sea addresses the issue of maritime delimitation, because this issue is closely related to the sovereignty of the coastal state, and the determination of maritime geographical boundaries plays a significant role in the authority and sovereignty of the coastal state and requires compliance with the principles set forth in the 1982 Convention on the Law of the Sea. The main question of the present study is what is the importance of examining the geographical boundaries of the delimitation of Iran and the Persian Gulf countries in the law of the sea? The aim of this study, relying on a qualitative research method based on a descriptive-analytical approach, is to understand the impact of the delimitation of the borders of Iran and the Persian Gulf countries and its impact on the coastal states of the Persian Gulf, which should be based on the standards of the international law of the sea. The present study showed that the Persian Gulf is of particular importance due to its semi-enclosed nature and the special conditions of the natural ecosystem and transit highway in the world. Several coastal countries are present in the Persian Gulf maritime belt, and our country also has the largest maritime border in the Persian Gulf. It can be acknowledged that our security, authority, independence, and national interests depend on determining the precise maritime boundaries in the Persian Gulf with neighboring countries. According to the findings of this study, given that in the Persian Gulf, Kuwait and Iraq have not defined their maritime borders, they lack maritime borders, and the rest of the Persian Gulf countries have also taken steps to delimit their maritime borders with Iran based on their maritime islands.