You will see picturesque flocks of greylag geese (oies cendrées) in the Dordogne, around Toulouse, in the Landes and around Strasbourg, but most of the geese for the foie gras sold in France are raised in Hungary.
The Strasbourg pie mentioned in T.S. Eliot’s Book of Practical Cats (‘And you might now and then supply/Some caviar or Strasbourg pie’) was made with foie gras, and was once very popular with diplomats and Russian nobles. It was invented in 1782 by chef Jean-Joseph Klose. Today if you see Strasbourg pie on a menu, it will probably be a dessert made with plums.
Image by Semnoz on Wikimedia Commons