SI is the abbreviation for Slovenia, the 151st largest country in the world. Officially the Republic of Slovenia, Slovenia is a country located in Balkans, bordering 4 countries – Austria, Croatia, Hungary, and Italy. Ljubljana is the capital city of Slovenia. Major cities include Ljubljana (population: 272,209), Maribor (population: 95,160), Celje (population: 37,509), Kranj (population: 36,863), Velenje (population: 25,445), Koper (population: 24,985), Novo Mesto (population: 23,330), Pt...