Well I called it "subregion" because in french they're called "departments", which probably doesn't make sense in english because it's not like "research departement" or "marketing departement" or anything...

It's called "Moselle", if you wanna look it up.

EDIT : Yep, nevermind lol in english they're also called department ! https://en.wikipedia.org/wiki/Moselle_(department)