Iraqi forces recaptured all territories overran by Daesh in northern and western Iraq in 2014.
"Our forces are in complete control of the Iraqi-Syrian border,” al-Abadi said in a televised speech in the capital Baghdad.
He said the Iraqi victory over the Daesh terrorist group has been realized with unity among Iraqis.
Iraqi forces have managed to recapture all territories overran by Daesh in northern and western Iraq in 2014.
“Our dream of liberation is now a reality and we have claimed victory against Daesh,” al-Abadi said. “The Iraqi flag flies high today over all Iraqi lands.”
“Preserve your union and begin a bright new future”, he added.
Al-Abadi said that anti-corruption drive will be an extension of rescue operations -- the next step Iraq will take.