Thanks for your reply - I mean by "cadastre" a map from www.gouv.fr It is truly amazing to think that they could be challenged, the gouv.fr maps that is. There is a dsiclaimer on my "vente" is this of any importance? it says:- ""L'aquereur reconnait avoir ete averti: que les superficies indiquees par le service du cadastre n'ont qu'une valeur administrative et ne sauraient engager la responsabilite de ce service. Qu'a ce jour aucun proces-verbal de bornage n'a ete etabli. Il declare faire son affaire personelle de ce etat de chose, sans recours possible contre le vendeur ou le notaire."" Are you able to tell me whether anyone can access the copy of our "vente" at a Hypotheque or other place? I thank you for consulting at the lower level in your formidable brain, many regards Charnizay