i never talk without an evidence
http://countrystudies.us/iran/19.htm
this is the website u can check it its written in words saying the history
i have copied a paragraph that proofs what i said
In 1970 the shah agreed to give up Iran's long-standing claim to Bahrain and to abide by the desire of the majority of its inhabitants that Bahrain become an independent state. The shah, however, continued to press his claim to three islands, Abu Musa (controlled by the shaykh of Sharjah) and the Greater and Lesser Tunbs (controlled by the shaykh of Ras al Khaymah). He secured control of Abu Musa by agreeing to pay the shaykh of Sharjah an annual subsidy, and he seized the two Tunbs by military force, immediately following Britain's withdrawal.
u can check it if u like
secondly im sry cauz i write in english cauz im a bit slow in arabic
and finally i dont want to proof anyone wrong but this is what i heard and learned from history
and about the atlas the original atlas have it as persian gulf not arabian gulf and stop saying the iranian atlas