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National Persian Gulf Day is a very important day for the Iranian people and it is celebrated annually on April 30th. It has taken place every year since 2004, and is marked with various ceremonies all over Iran, especially in the coastal cities of the Persian Gulf.  The Persian Gulf, in Western Asia, is an extension of the Indian Ocean located between Iran (Persia) and the Arabian Peninsula.
According to the book Documents on the Persian Gulf's name : the eternal heritage of ancient time the term Persian Gulf and its equivalents have been used continuously since 400 BC, but in 1964 the Arab league ratified a change of the name the Arabian Gulf. Apparently, this change was not accepted by some Arab countries. After the Iran-Iraq war, the decision was realised. The act angered Iran/Iranians, especially when the Arabs tried to use the name Arabian Gulf in the English mass media. While historical documents show that the waterway has always been referred to as the 'Persian Gulf,' certain Arab states have mounted efforts to remove 'Persian' from the name of the waterway. After many gatherings and seminars by the NGOs and the geographers of Iran asking the government to preserve the heritage name of the Persian gulf, finally The Islamic Republic of Iran, in 2004 officially designated April 30 as the "National Persian Gulf Day", since the date coincides with the anniversary of Shah Abbas,' a successful military campaign against the Portuguese navy in the Persian Gulf, driving the Portuguese colonial forces out of the Strait of Hormuz in the Capture of Ormuz (1622). The decision was taken by the High Council of Cultural Revolution, presided over by former President Seyed Mohammad Khatami, the council mentioned the campaign launched recently by certain Arab states to rename Persian Gulf as the drive behind the decision. In 1514 the Portuguese captured Hormuz and built a fort. For more than a century the island remained Portuguese, but they were routed and forced to withdraw after 100 years by the Iranian forces. The Portuguese then lost all their colonial lands in east Africa and were forced back to Mozambique. .