The demonstrations, which took place on Sunday, were against the high cost of living and the lack of climate action by the current French government.
According to organizers, 140,000 people joined the demonstrations, which were led by four unions that are now calling for a general strike.
According to French media, there were about 29,500 demonstrators in Paris.
At the head of the train that departed from the Place de la Nation was left-wing leader Jean-Luc Mélenchon, who was flanked by, among others, Annie Ernaux.
In an interview with Babel after she was announced as a Nobel laureate, the author said she intends to continue to engage politically.
- Now I don't just want to write about injustices in society, I want to try to change things as a debater.
I want to speak, said Annie Ernaux to SVT.
Earlier this week, Ernaux's publisher Gallimard announced that they will print a million new copies of her books, as a result of her being awarded this year's Nobel Prize in Literature.