Åbo and Björneborg County, Åbo och Björneborgs län or Turun ja Porin lääni, was a County of Sweden from 1634 to 1808, named after the cities of Åbo and Björneborg. After the Treaty of Fredrikshamn in 1808 it continued to be a County of Finland until a reform in 1997 introduced a new administrative entity, the Provinces of Finland. Åland was part of the county from 1634 until it gainined autonomy in the 1920s, within independent Finland.