Sweden was a country in northern Europe, neighbouring Norway, Finland and Denmark.
The Third Doctor and Jo Grant visited Sweden in 141 and encountered the Master. (PROSE: The Spear of Destiny)
The Eighth Doctor and Izzy visited Sweden in 1070. (PROSE: Illumination)
The Eighth Doctor and Lucie Miller visited 19th century Sweden. (AUDIO: Grand Theft Cosmos)
Musical group ABBA was from Sweden. (PROSE: The Twilight Streets)
The Eighth Doctor and Fitz Kreiner visited Sweden in 1999. (PROSE: Dominion)
When trying to gain access to Rosanna Calvierri's school for girls in Venice in 1580, Rory Williams used the psychic paper as a reference from the King of Sweden. (TV: The Vampires of Venice)