A top adviser to Iran's Supreme Leader Mojtaba Khamenei has threatened that Tehran's allies could shut the Bab al-Mandeb shipping route as Iran has effectively done with the Strait

A top adviser to Iran's Supreme Leader Mojtaba Khamenei has threatened that Tehran's allies could shut the Bab al-Mandeb shipping route as Iran has effectively done with the Strait of Hormuz. Here's what you need to know about the crucial waterway