The police are calling for witnesses to try to find Coralie, 16, missing since Monday March 11.
The teenager has not given any sign of life since her last appearance in Montesson (Yvelines).
Coralie is 1.70 m tall, has green eyes and light brown hair cut in a bob.
At the time of her disappearance, she was wearing gray/blue ski pants and a black hat.
According to investigators, she could be in the Conflans-Sainte-Honorine area.
The police are launching an appeal to try to find the teenager.
DR
Anyone who has seen her or may have information is asked to contact the Saint-Germain-en-Laye police station at 01.39.10.91.22 or 01.71.51.90.05.
In France, there are around 43,000 reports of disappearances of minors, including 41,500 runaways (or 96%).
For the approximately 1,100 other cases of worrying disappearances, this concerns girls in 56% of cases.