BERLIN — Several hundred peace activists have started what they say will be a monthslong protest march from Berlin to war-ravaged Syria to urge an end to the fighting there.

The Civil March for Aleppo set off carrying white flags from Berlin’s former Tempelhof Airport on Monday.

Organizers said they expect to cover about 12 miles a day and to take about 3 1/2 months to walk through Germany, the Czech Republic, Austria, Slovenia, Croatia, Serbia, Macedonia, Greece and Turkey. Some will walk part of the way while others are invited to join along the route. Marchers are being told to provide their own sleeping gear and food.

Participants hope to at least reach Turkey’s border with Syria and if possible the Syrian city of Aleppo, the recent scene of heavy fighting and widespread misery.

“It’s time to act,” the group wrote in a manifesto on its website.

“We’ve had enough of clicking the sad or shocked faces on Facebook and writing, ‘This is terrible.”‘