How to pick the perfect wizard school for you
Memory Charms erase any recollection of its whereabouts to visitors, but we believe it’s in Northern Europe.
Scruton, Pam. "Jo in Glasgow (longish - 'cos we enjoyed it)" [forum posting about J.K. Rowling reading for Maggie's Cancer Caring Centre], Harry Potter for Grown-ups, December 9, 2000.
Jo thinks that Durmstrang is in northern Scandinavia - the very north of Sweden or Norway and that Beauxbatons is somewhere near Cannes in the south of France. She says she doesn't know for certain because, of course, the exact whereabouts of these schools is a closely- guarded secret to which she is not privy!