with the transfer of 529912 meters square of West German land parcels (that had administratively been part of the German towns of Konstanz, Öhningen, Rielasingen, Wiechs am Randen, Altenburg, Stühlingen, Weizen and Grimmelshofen) in exchange for the transfer to West Germany of an equal area of Swiss land parcels (which had administratively been part of the Swiss towns of Kreuzlingen, Hemishofen, Büttenhardt, Opfertshofen, and Merishausen).