My heart says Limousin Auvergne. Massif Central in other words. Good memories of my childhood in Puy-de-Dôme and Corrèze.
I love, the landscapes of the area of Marseille and Sète.
Well, other than that, I can't really say I have a favorite region.
Be careful, Hash said "excluding your home/native region"...
Héhé. Which is fine given that I left my native city (Chamonix), 3 weeks after I've been born, and moved a lot of time then, mainly in the big south part of France.
Well, in the whole France I find beautiful things, but my favorite parts remain those I cited.
And Corsica, hmm, I went there a few days, I stayed in the north of the island, and that has been the first time I had been so marked by what can be the insularity, I really had a feeling of isolation there, even in an animated city like Bastia, from which we can also see the Italian costs sometimes IIRC.