Ireland ( ), also known as the Republic of Ireland is a European country on the island of Ireland. It is a member of the European Union. The country is sometimes called the "Republic of Ireland" in order to distinguish between the territory of the Irish state and island proper, but Ireland is its official name. It covers about five-sixths of the island of Ireland. The other sixth is called Northern Ireland, which is still part of the United Kingdom. The republic's capital is Dublin. Cork is the second largest city in the country and the third largest on the island of Ireland. The population of Ireland is 4.6 million. English is the main language spoken. The Irish language is widely taught in all schools, and it is still spoken as a first language in some areas of the country, known as the Gaeltacht. Irish is the first official language, followed by English.