The news of the reporter's freedom came as his captors, fighters from the Islamic State of Iraq and the Levant, fled areas near the Turkish border, leaving behind at least two mass graves, with one containing 17 bodies, activists said.
Correspondent Marc Marginedas was abducted on Sept. 4 near the central Syrian city of Hama by Islamic State fighters. He was "moved repeatedly" while in captivity, and his captors accused him of being a spy before his release, his newspaper El Periodico said.
Syria, engulfed in a three-year conflict, is the most dangerous country in the world for journalists. The New York-based Committee to Protect Journalists estimates more than 30 international and local reporters are currently in captivity.
The vast majority of the kidnappings over the past six months have occurred in opposition-held parts of northern and eastern Syria, where the Islamic State was particularly strong and widely despised for their heavy handed tactics.
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Since December, a loose coalition of rebels has been fighting the militants.
The fighters left towns north of Aleppo, including Azaz near the Turkish border, activists said. They withdrew toward al-Bab and Manbij east of Aleppo, and to their stronghold in the eastern city of Raqqa, said an Aleppo-based activist who uses the name Abu Raed.
As the Islamic State fighters withdrew, residents found at least two mass graves in their wake, Syrian activists said. It appeared the dead were Syrian rebels belonging to rival brigades or activists, Abu Raed said.