evidence: The island of Ireland is located in the North Atlantic and is the 3rd largest island in Europe with an area of 32,595 square miles (84,421 square kilometers) which ranks 122nd in the world in terms of size. The Republic of Ireland covers 5/6 of the island while Northern Ireland, part of the United Kingdom, covers the rest of the island. As of 2017, the population of Ireland was 4.784 million people, leading to a population density of roughly 147 people per square mile (57 people per square kilometer) which ranks at roughly 122nd in the world in terms of population density. Nearly two-thirds of the Irish population live in urban areas, and several significant cities reflect this. The capital and largest city of the Republic of Ireland is Dublin, which has an urban population of 1.9 million. Dublin was originally founded as part of a Viking settlement, becoming the nation's principal city after the Norman invasion. Dublin covers just 44 square miles, making the population density 43,181 people per square mile. Cork is the next largest city in Ireland with a population of 399,216. Other major cities with populations in the 100,000 range include Limerick, Galway, and Swords.