Where property auctions are advertised in France ?

There is no single, comprehensive source of information about forthcoming auctions and so you will need to use various websites such as https://www.licitor.com/ or https://www.vlimmo.fr/ or http://www.encheres-publiques.com/

Auctions are also advertised in the legal columns of the national and regional press.

The law also requires that notice of an auction be posted at the property itself and you will also find notices concerning auctions on the notice boards outside the local court (Tribunal Judiciaire).