It’s incredible how many places are “at risk”… this first link talks about the Sud Ouest
but check the Legifrance link too… and work down towards the Annexe at the bottom to find the table which gives the Towns/Departments etc…
this is just a taster.
That was the crack that Trump made a few weeks ago when he was dissing climate change and sea levels rising, "One hundredth of an inch ! - but we’ll have more seafront properties ! "