Büttenhardt (pronunciation: ˈbʏttənˌhaɐt) is a municipality in the canton of Schaffhausen in Switzerland.

Verenahof (also known as Büttenharter Hof or Verenahöfe) was a German exclave in Switzerland, administratively part of the West German town of Wiechs am Randen (which is now part of the town of Tengen).

Geographically, it was separated from the rest of West Germany by a 200–300-metre wide strip of Swiss territory.

In 1964 a treaty was concluded between West Germany and Switzerland, which entered into force on 4 October 1967.

The 43-hectare territory, containing three houses and fewer than a dozen people, became part of Switzerland[5][6] with the transfer of 529,912 square metres (5,703,930 sq ft) 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).

[7] Concurrently the exclave of Büsingen am Hochrhein continued to remain part of Germany administratively and politically and following the land swap involving Verenahof it is now the sole remaining exclave of Germany wholly surrounded by the territory of another country (Switzerland), whilst Verenahof now forms part of the Swiss municipality of Büttenhardt.

At the town hall in Wiechs am Randen there are some remaining border markers that became obsolete with the land swap in 1967 whilst in Büttenhardt, at the old school house, some old border markers from the 1930s have been used to frame bushes planted around the former enclave.

Büttenhardt children began attending the Lohn preschool in the 2009–2010 school year.