[Arodex]

>Yes, I'm well aware that Landes naturally should be an extensive sandy marsh.

No, it shouldn't. It used to be a forest but was cut down by firewood and sheep grazing.

Stop with the "return to nature" fallacy. With how things are going, even "natural" forests are going to burn down.

[jcattle]

Ah, I thought that was the main vegetation present beforehand? What kind of forest was it before it was cut down?

[Arodex]

A mixed forest with oak, beech and the like, as you can find higher north. But that was during the middle ages' European "little ice age", when the winters were much colder, and the Thames and the Netherlands froze over. That's also likely the reason why the forest was cut so much to feed fires.

https://daily.jstor.org/climate-canvasses-of-the-little-ice-...