The Islamic State group has lost 22 percent of the territory it held at the start of 2015, military analysts IHS Jane's said Wednesday, as US and Russian air strikes have helped the jihadists' opponents advance.
IS controls swathes of territory in Iraq and Syria but lost 14 percent of it last year and a further eight percent this year, according to the IHS Conflict Monitor.
IHS Jane's said the jihadists controlled 73,440 square kilometres (28,360 square miles) of ground as of Monday, an area equivalent to around half the size of England.
The Syrian government has made gains in the west of the country and is now five kilometres outside the ancient city of Palmyra, which was overrun by IS fighters in mid-2015.
"The Islamic State is increasingly isolated, and being perceived as in decline," said IHS senior analyst Columb Strack.
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