A really really great thanks !
Here are the GC’s :

Drapeau 1 https://www.jigidi.com/solve/zcynd5b7/europe/ GCA1BPQ
Drapeau 2 https://www.jigidi.com/solve/2dxbcff7/lorraine/ GCA1BQY
Drapeau 3 https://www.jigidi.com/solve/4ogelvox/france/ GCA1BRB

I’m only missing those coordinates now :
GOAL ! https://www.jigidi.com/solve/ha8riyiz/ballons/ GC9V5QG

(pretty please…. ^_^)