Anaïs, 14, disappeared Wednesday July 28 in the area of Villennes-sur-Seine, in the Yvelines.
A call for witnesses was launched by the police.
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The young girl left her father's home, in the Renardières district, without her phone and her transport card.
She left behind a letter detailing her runaway.
According to the authorities, she is likely to go to Vernouillet park.
She has brown and blond hair at the tips, brown eyes, is 1.70m tall. When she left, she was wearing a black t-shirt and jogging pants. If you have information, you can dial 0178731111.