Mosul's historic Al-Nuri Mosque with its famed leaning minaret, nicknamed Al-Hadba or "hunchback", has been restored using its original brickwork, years after it was reduced to rubble under Islamic State group rule.

"I am very happy to stand before you and before the minaret over 850 years old... and the fact to have it here behind me in front of you is like history coming back... is like the identity of the city coming back," Audrey Azoulay said.

The mosque and minaret were destroyed in June 2017 during the battle to oust IS from Mosul, and Iraq's authorities accused the jihadists of planting explosives before their withdrawal.

They are the latest landmarks in Mosul to be restored by UNESCO, whose teams have worked for five years to revive several sites.

"The reconstruction of this minaret needed to reuse nearly 45,000 original bricks," the UNESCO chief said, adding that traditional techniques were used to rebuild the iconic structure.

Azouley said residents had wanted the rebuilt minaret to resemble the original. "The people of Mosul wanted it tilted," she said.

Eighty percent of Mosul's old city was destroyed in the fight against IS.

UNESCO restoration project also include Al-Tahira and Our Lady of the Hour churches and 124 heritage houses.

Prime Minister Mohammed Shia al-Sudani will inaugurate the restored landmarks in the coming weeks.