Strait of Hormuz
The Strait of Hormuz /hɔːrˈmuːz/ Persian: تنگه هرمز Tangehyyeh Hormoz 
listen , Arabic: مَضيق هُرمُز Maḍīq Hurmuz) is a strait between the Gulf of Oman and the Persian Gulf. It provides the only sea passage from the Persian Gulf to the open ocean and is one of the world's most strategically important choke points. On the north coast lies Iran, and on the south coast the United Arab Emirates and Musandam, an exclave of Oman. At its narrowest, the strait has a width of 29 nautical miles (54 km).
About 20% of the world's petroleum (about 35% of the petroleum traded by sea) passes through the strait, making it a highly important strategic location for international trade.
The opening to the Persian Gulf was described, but not given a name, in the Periplus of the Erythraean Sea, a 1st-century mariner's guide:
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