*Jabhat al-Nusra, al-Qaeda’s Syrian affiliate
Primary oil routes
(For the meaning of symbols: Go to Bron/ Source)
Isis controls most of Syria’s oil fields and crude is the militant group’s biggest single source of revenue. Here we follow the progress of a barrel of oil from extraction to end user to see how the Isis production system works, who is making money from it, and why it is proving so challenging to disrupt, even with airstrikes.