Ireland is an island in the Atlantic off the north-western coast of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth. To its east is the island of Great Britain, from which it is separated by the Irish Sea and North Channel.
Politically, Ireland is divided between the Republic of Ireland, which covers five-sixths of the island, and Northern Ireland, a part of the United Kingdom, which covers the remaining area and is located in the north-east of the island. The population of Ireland is approximately 6.4 million. Just under 4.6 million live in the Republic of Ireland and just over 1.8 million live in Northern Ireland.
The island's geography comprises relatively low-lying mountains surrounding a central plain, with several navigable rivers extending inland. The island has lush vegetation, a product of its mild but changeable oceanic climate, which avoids extremes in temperature. Thick woodlands covered the island until medieval times. As of 2013, the amount of land that is forested in Ireland is about 11% of the total land area, compared with European average of 35%. There are twenty-six extant mammalspecies native to Ireland.
The island was converted to Christianity from the 5th century onward. Following the Norman invasion in the 12th century, England claimed sovereignty over Ireland. However, English rule did not extend over the whole island until the 16th–17th century Tudor conquest. This led to thecolonization of northern Ireland by settlers from Britain. In the 1690s, a system of Protestant English rule was designed to materially disadvantage the Catholic majority and Protestantdissenters, and was extended during the 18th century. In 1801, Ireland became a part of the United Kingdom. A war of independence in the early 20th century was followed by the partition of the island, creating the Irish Free State, which became increasingly sovereign over the following decades, and Northern Ireland which remained a part of the United Kingdom. Northern Ireland saw much civil unrest from the late 1960s until the 1990s. This subsided following a political agreement in 1998. In 1973, both parts of Ireland joined the European Economic Community.
Irish culture has had a significant influence on other cultures, especially in the fields of literature and, to a lesser degree, science and education. Alongside mainstream Western culture, a strong indigenous culture exists, as expressed for example through Gaelic games, Irish music, and the Irish language. The culture of the island has also many features shared with Great Britain, including the English language, and sports such asassociation football, rugby, horse racing and golf.