High Quality Content by WIKIPEDIA articles! The geography of Ireland describes an island in northwest Europe in the north Atlantic Ocean. The main geographical features of Ireland include low central plains surrounded by a ring of coastal mountains. The highest peak is Carrauntoohil (Irish: Corrán Tuathail), which is 1,041 metres (3,415 ft) above sea level. The western coastline is rugged, with many islands, peninsulas, headlands and bays. The island is bisected by the River Shannon, which at 259 km (161 mi) with a 113 km (70 mi) estuary is the longest river in Ireland and flows south from County Cavan in Ulster to meet the Atlantic just south of Limerick. There are a number of sizeable lakes along Ireland's rivers, of which Lough Neagh is the largest. Politically, the island consists of the state, Ireland, with jurisdiction over about five sixths of the island; and Northern Ireland, a constituent country of the United Kingdom, with jurisdiction over the remaining sixth. Located west of the island of Great Britain, it is located at approximately 53°N 8°W / 53°N 8°W / 53; -8Coordinates: 53°N 8°W / 53°N 8°W / 53; -8. It has a total area of 84,421 km2 (32,595 sq mi). It is separated from Great Britain by the Irish Sea and from mainland Europe by the Celtic Sea.