The announced defeat of the Syrian rebellion and the Islamic State is favoring the extension of Iranian influence in the Levant. The Iranian corridor between Beirut and Tehran via Baghdad and Damascus is now a reality. Territorial continuity was achieved symbolically at the end of May 2017, when Iranian-funded Shia militias joined on both sides of the Syrian-Iraqi border north of al-Tanf. In Iraq, Iranian allies Syria and Lebanon dominate; people support them out of fear, default, or sympathy. If the West wants to fight against the Islamic Republic's influence in the Levant, it must understand the root causes pushing more and more Lebanese Christians, Iraqi Shiites, and Syrian Sunni Arabs into the Iranian camp.