The Dominions of Sweden or Svenska besittningar were territories that historically came under control of the Swedish Crown, but never became fully integrated with Sweden. This generally meant that they were ruled by Governors-General under the Swedish monarch, but within certain limits retained their own established political systems, essentially their diets. Finland was not a dominion, but an integrated part of Sweden. The dominions had no representation in the Swedish Riksdag as was said by the Instrument of Government (1634) paragraph 46: "No one, who is not living inside the separate and old borders of Sweden and Finland, have anything to say at Riksdags and other meetings..."
Read more about Dominions Of Sweden: Baltic Dominions, Scandinavian Dominion, Continental Dominions