A surprisingly challenging quiz. I suggest accepting 'Kemiönsaari' for Kimitoön. It's the standard Finnish-language name for the island.
Also (and I know this might be a needless complication), Åland (Ahvenanmaa in Finnish, but as the province is monoligually Swedish-speaking, I think using just the Swedish name is fine) consists of several islands, the largest of which is called 'Fasta Åland' (Manner-Ahvenanmaa or Ahvenanmanner in Finnish) and has an area of 685 km². These names and distinctions, however, are very, very rarely used. I have no useful suggestion as to how to resolve this in the context of this quiz, but Åland definitely isn't a single island with an area of 1,017 km².
Also (and I know this might be a needless complication), Åland (Ahvenanmaa in Finnish, but as the province is monoligually Swedish-speaking, I think using just the Swedish name is fine) consists of several islands, the largest of which is called 'Fasta Åland' (Manner-Ahvenanmaa or Ahvenanmanner in Finnish) and has an area of 685 km². These names and distinctions, however, are very, very rarely used. I have no useful suggestion as to how to resolve this in the context of this quiz, but Åland definitely isn't a single island with an area of 1,017 km².