After retaking Al-Qa'im, Iraqi forces have reportedly begun operations to clear the deserts north of the crossing, leaving little room for ISIS to thrive. It is located near al-Qaim, and as Iraqi forces continue to recapture their cities, many predict that it will not take long before ISIS loses their ground on Rawa.
A source from militias allied to Damascus told AFP that fighters from Lebanon's pro-regime Hezbollah movement had advanced to the southern edges of Albu Kamal on Wednesday.
Despite its losses, Islamic State still has a territorial presence in Libya and elsewhere, and many governments expect it to remain a threat even after it loses the caliphate it declared from Mosul, Iraq, in 2014.
The shift is allowing the U.S.to redirect some of its efforts to Afghanistan to help that nation's government battle Taliban fighters.
As ISIS is destroyed in Iraq, Croft said Iraqi security forces will not cross the border into Syria to pursue them.
Russian official media have in recent weeks reported a surge of strategic bombing and cruise missile strikes on Islamic State targets in eastern Syria as the army advanced.
The US-backed Syrian Democratic Forces (SDF) have also been carrying out offensives in the area. Both the Syrian and Iraqi militaries, along with their allied militias and respective worldwide sponsors, have largely defeated ISIS, but parts of Syria remain under rebel and Kurdish control.
Syrian forces captured the provincial capital, Deir al-Zour, from IS on Friday.
More than 330,000 people have been killed in Syria since the conflict began in March 2011 with anti-government protests, before spiralling into a complex, multi-front war that drew in worldwide forces and jihadists.