We must've been through hundreds of books already and we can't find him anywhere —
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"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
J. K. Rowling had previously stated that Beauxbatons was located near the city of Cannes. Pottermore, however, retcons this, instead placing its location in the Pyrenees. It is, of course, possible that Cannes is the departure point of some sort of French equivalent of the Hogwarts Express.