Rio de Janeiro (Brazil) is 2.2 times larger than Slovenia.
Area: 20,273 km2 World Factbook
Population: 1,988,292 (July 2014) World Factbook
Slovenia, officially the Republic of Slovenia, is a nation state in southern Central Europe at the crossroads of main European cultural and trade routes. It borders Italy to the west, Austria to the north, Croatia to the south and southeast, and Hungary to the northeast. Wikipedia
Rio de Janeiro is one of the 27 states of Brazil. It has the third largest economy of Brazil, with the largest being that of the state of São Paulo, and the second being that of Minas Gerais. The state of Rio de Janeiro is located within the Brazilian geopolitical region classified as the Southeast. Wikipedia