South Lebanon is a region of southern Lebanon that contains the major port cities of Sidon and Tyre and towns such as Jezzine, Rachaiya, Marj Ayyun (Jdeidah/Marjayoun), and Tebnine. The region is mostly Shia Muslim, with a considerable Christian minority in the 100% Christian villages of Rmaich, Ain Ebel, Debel, and Qaouzah. Because of its Shi'ite majority, it has been a major base for Hezbollah and other Shi'ite groups, and for this reason the Israeli Air Force has carried out thousands of airstrikes on the region since the Lebanese Civil War. The civil war saw Israel occupy the region in alliance with the South Lebanon Army, but they withdrew in 2000, leaving the region in Lebanese hands. The region had also been used by the Palestine Liberation Organization as a base for cross-border attacks from Black September in 1970 until Israel's 1982 invasion of Lebanon during the Lebanese Civil War, with the Israelis invading South Lebanon to put an end to the PLO's rocket attacks and cross-border raids once and for all.