Islamic State's territory shrank by 40 percent from its maximum expansion in Iraq, and by 20 percent in Syria in 2015, as international forces pushed its militants out of several cities, a spokesman of the U.S.-led coalition said on Tuesday.
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ISIS in 2014 swept through a third of Iraq, seizing Mosul, the largest city in the north, and reaching the vicinity of Baghdad.
Counter-offensives by Iraqi and Kurdish armed forces supported by the U.S.-led coalition, and by Iran-backed Shi'ite militias forced them out of several cities since, including Tikrit, north of Baghdad, and Ramadi, to the west.
In Syria, ISIS is fighting the army of Syrian President Bashar Assad and other rebel groups opposed to his rule. It is facing air strikes by the U.S.-led coalition and by Russia which has sent warplanes to support the Syrian government.