Raqqa will be part of a decentralised federal Syria now the city has been freed from Islamic State, the US-backed militias that captured it said on Friday, tying its political future to Kurdish-led autonomy plans for northern Syria.
The Syrian Democratic Forces said the handover would not be immediate, with SDF fighters still combing the city of Raqqa.
Days ago in Syria's Raqqa, die-hard jihadists made their final stand in the city's national hospital. On Wednesday, it stood eerily silent, its entrance inhabited only by swarming flies and two rotting corpses.
US-backed forces took full control of Raqqa from the Islamic State group on Tuesday, defeating the last jihadist holdouts in the de facto Syrian capital of their now-shattered "caliphate".
Raqqa was once the de facto Syrian capital of the jihadists' self-styled "caliphate" in Syria and Iraq, but IS now holds just 10% of the city.
Dozens of Islamic State group fighters have surrendered over the past day in their one-time bastion Raqqa, the US-led coalition backing the offensive on the Syrian city said Saturday.