There are lots of websites where you can search for rural housing in france, but it's quite fragmented so there is no real one-stop-shop where you can find ever

There are lots of websites where you can search for rural housing in france, but it's quite fragmented so there is no real one-stop-shop where you can find everything. You can start here though: https://www.proprietes-rurales.com/ https://www.proprietes-rurales.com/ (I am not affiliated in any way with the website, was just the first one i found)