The Islamic State’s ‘caliphate’ shrunk by 12,800 km2 to 78,000 km2 between 1 January and 14 December 2015, a net loss of 14%, according to the latest estimates by the IHS Conflict Monitor team.

Losses in 2015 include large swathes of Syria’s northern border with Turkey, including the Tal Abyad border crossing, which was the group’s main access point to the Turkish border from their de-facto capital Raqqa.

Other substantial losses in Iraq include the city of Tikrit, the fiercely contested Beiji refinery complex, and a stretch of the main highway between Raqqa and Mosul, complicating the transfer of goods and fighters between the two cities. […]