Syrian government forces have swept across territory south of Islamic State group stronghold Raqa, capturing a string of villages and oilfields from the jihadists, state media said.
The landscape south of Raqa city strategically borders several provinces: Aleppo to the west, Homs to the south and Deir Ezzor -- much of which is still held by IS -- to the east.
"Over the past two days, army units recaptured a number of villages and oilfields in western parts of Deir Ezzor province and southern parts of Raqa," the agency said.
It said "dozens" of IS vehicles had been destroyed and that a number of jihadists, including foreigners, had been killed.
The Syrian Observatory for Human Rights said today the government advance was backed by heavy Syrian and Russian air strikes.
"Regime forces have captured between 1,500 and 1,800 square kilometres in Raqa province over the past 48 hours," Observatory head Rami Abdel Rahman said.
He said troops were approaching the strategic region of Jabal al-Bishri, a mountain chain straddling parts of Raqa, Deir Ezzor and Homs provinces.
"If the regime captures it, it can take control of all those areas," Abdel Rahman said.
Since 2014, Raqa city has served as the de facto capital of IS territory in Syria, and US-backed fighters are currently battling jihadists inside the city.
But rival Syrian government troops have also chipped away at IS-held territory in the broader province.
Last month, regime forces targeted the US-backed Syrian Democratic Forces alliance west of Raqa. The Pentagon downed a Syrian jet in retaliation.
More than 330,000 people have been killed since Syria's conflict erupted in March 2011 with anti-government protests.
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