Hope you’r fine
French administration (SGMAP) has recently answered me about borders
it seems there are two data sources about french territory and borders compatible with the objective : build a more detailled background map for Gephi
They answered me there : https://github.com/etalab/api-communes/issues/75#issuecomment-295640187
Would you be able to have a look please ?
Thank you so much for your kind collaboration.