"Persian Gulf." YourDictionary, n.d. Web. 11 December 2018. <https://www.yourdictionary.com/persian-gulf>.
Persian Gulf. (n.d.). Retrieved December 11th, 2018, from https://www.yourdictionary.com/persian-gulf
also Arabian Gulf
An arm of the Arabian Sea between the Arabian Peninsula and southwest Iran. It has been an important trade route since ancient times and gained added strategic significance after the discovery of oil in the Gulf States in the 1930s.