geographers in medieval Islam were using the word Bahre Fars بحر فارس (Persian sea) to mention the current body of water in the north of Indian Ocean, In the Book Documents on the Persian Gulf's name, Pages 60 to 84 explained the description of the Persian Sea in the 40 books of Muslims from10 to 18 centuries . they called the seas of south part of Iran, Indian subcontinent and the Arabian Peninsula as the Persian Sea, sometimes Indian sea and rarely Macran sea and Oman sea among them :