The Slovak Republic (or, in short form, Slovakia /sloʊˈvɑːkiə/ or /sləˈvækiə/; Slovak: Slovensko (Slovak pronunciation: [ˈslovɛnsko] ( )), long form Slovenská republika (Slovak pronunciation: [ˈslovɛnskaː ˈrɛpublɪka] ( ))) is a sovereign state in Central Europe. It has a population of over five million and an area of about 49,000 square kilometres (19,000 sq mi). Slovakia is bordered by the Czech Republic and Austria to the west, Poland to the north, Ukraine to the east and Hungary to the south. The largest city is the capital, Bratislava, and the second largest is Košice. Slovakia is a member state of the European Union, NATO, the United Nations, the OECD and the WTO, among others. The official language is Slovak, a member of the Slavic language family.