Islamic State of Iraq and Syria (ISIS) also known as
Islamic State of Iraq and the Levant (ISIL)
Active: 1999 to present
Leader: Abu Bakr al-Baghdadi
Area of operations: Iraq, Syria, and Lebanon
Size: estimated between 47,600–257,900
Map of Syrian Civil War, Iraq War, and Lebanese Insurgency: dark gray areas indicate ISIS controlled regions (click on image for map key and more detailed explanation).
Map by BlueHypercane761 via Wikimedia Commons