Article R521-5 of the French Commercial code
The entry is made in a register kept by the competent registrar. This registrar shall be, as the case may be, the registrar of the commercial court, the registrar of the judicial court ruling on commercial matters or the registrar of the mixed commercial court within whose jurisdiction the debtor, or the owner of the collateral if he is not the debtor, is principally registered in the register of commerce…