This map of Syria shows why the war will be so difficult to end: ontrol in Syria. Map by Frontline (NASA/Microsoft)
PBS Frontline's Evan Wexler and Sarah Childress put together this map showing which of the four major groups in Syria control which territory, as part of Frontline's new hour-long program on fighting there.
The map shows control divided between government forces, rebels with the ethnic Kurdish minority, rebels with the extremist Islamist group ISIS (Islamic State of Iraq and Syria), and the mainline rebel opposition.
These groups are four different colors for good reason: with the quasi-exception of the Kurds, who mostly just want Kurdish autonomy or independence, the other three groups all hate each other, all want to control Syria and all have very different visions for the country. And, as you can see, each controls a lot of territory.