And then it's also interesting looking at Vendée (the Southernmost department in the Pays de la Loire), which was traditionally the most conservative area in France and was De Villiers' fief, but now only the Fontenay-le-Comte (the historic capital of Vendée) area voted RN, the rest voted LREM. I guess Vendée is still conservative but it is wealthier and has less immigration than other regions and thus explains its current voting patterns.
Moreover the bougie-right parts of Paris and the Petite Couronne seem to have been LREM's strongest area in the whole country. Antonio's been talking to me a lot off-forum about Macronism's seduction of much of the traditional right's support base.
It's also interesting (and depressing) to see the concatenation of the post-industrial North and the right-rightist Riviera as RN's two strongest areas.