Wikipedia
Untermainkreis
The Untermainkreis (German: Lower Main District) was one of the administrative districts (German: Bezirke or Regierungsbezirke) of the Kingdom of Bavaria between 1806 and 1837 named after its main river Main. It was the predecessor of the administrative district of Lower Franconia ( Regierungsbezirk Unterfranken). Administrative headquarters were in Würzburg.