Stage 4 is possibly finishing in the city of Rouen; Stage 5 could be a time-trial around the city of Caen; and the race would then go to Bretagne where it's reported that stage 6 finishes in Saint-Méen-le-Grand before the peloton finishes atop the famous Mur de Bretagne the following day.
The race will likely keep heading south through the western half of the nation and stage 9 is possibly finishing in Châteauroux. However the second half of the race is under close curtains. Bagnères-de-Luchon could host a finale in the Pyrenees; whilst French media have also mentioned a possible return of Mont Ventoux... Recently, it has been known that Sestrière will likely host a finale (after the Colle delle Finestre) of either a Giro d'Italia or
Tour de France stage, but not in both and so it is unknown still where this will be. A finale in Varese, Italy, is also possible; but the race will return to Paris for it's grand finale after Nice hosted it this year.