The countries that make up Scandinavia are Sweden, Norway and Denmark. Finland and Iceland are sometimes included as well. Sweden, Norway and Finland are found on the actual Scandinavian peninsula in the north of Europe. Denmark is on a peninsula in the north of continental Europe, and Iceland is an island in the North Atlantic.
Sweden, the largest of the Scandinavian countries, is 173,860 square miles in area and borders Finland and Norway. It's a parliamentary constitutional monarchy. As of 2014, King Carl XVI Gustav is its head of state, Fredrik Reinfeldt is its Prime Minister, and Stefan Löfven is the Prime Minister designate. The population as of July, 2014 was 9,723,809.
The Kingdom of Norway is also a constitutional monarchy that's a bit smaller than Sweden, at 148,747 square miles in area. In 2014, its King is Harald V, and its Prime Minister is Erna Solberg. The population as of July, 2014 was 5,147,792.
Denmark is the smallest Scandinavian country. It is 16,562.1 square miles in area if the territories of Greenland and the Faroe Islands aren't counted. Like Norway and Sweden, it's a constitutional monarchy, with Margarethe II as head of state in 2014. The population as of July, 2014 was 5,569,077.