By Jean Marc Mojon with Tony Gamal-Gabriel in Beirut
Multiple ground assaults and a deluge of air strikes shrank the Islamic State group's "caliphate" to a rump and decimated its fighters in 2016 but the organisation remains a potent threat.
The jihadists have squandered close to half of the land they controlled in 2014 and many of their losses came this year, which saw major operations by myriad forces and countries.
The loss of symbolic bastions such as Fallujah in Iraq or Dabiq in Syria dented IS's aura, revealing it could not defend places it once vowed were impregnable and central to its own mythology.
The jihadists were driven out of Ramadi, the capital of Iraq's vast western province of Anbar, as well as Manbij in Syria -- strategic areas crucial to the caliphate's territorial continuity.
Earlier this month, they also lost Sirte, their last major bastion in Libya, a country the jihadists had hoped could drive the expansion of the caliphate.
In October, tens of thousands of Iraqi forces backed by air strikes from a US-led coalition launched a massive operation to retake Mosul, the city where IS supremo Abu Bakr al-Baghdadi proclaimed his "state" in June 2014.
The going has been tough for the security forces in the booby-trapped and sniper-infested streets of Iraq's second city but there is little doubt the vastly outnumbered jihadists will eventually lose their stronghold.
Shaping operations for a similar assault on Raqa, the only other major urban centre in IS hands, were subsequently launched in Syria setting up a battle that could be the caliphate's last stand.
"The loss of Raqa will mean the end of IS's state-building project and would leave the group with no territorial symbol justifying its name of Islamic State," said Mathieu Guidere, a Paris-based professor of Middle East geopolitics.
Western powers, Turkey, Iran, Iraqi and Syrian Kurdish forces and militias and paramilitary outfits have played a part in the surge against IS in 2016.
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