The highest peak is Carrauntoohil , which is 1041 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 386 km (240 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 .
It has a total area of 84421 km²; (32,595 sq mi). It is separated from Great Britain by the Irish Sea and from mainland Europe by the Celtic Sea.
Ireland and Great Britain, together with nearby islands, are known collectively as the British Isles, as the term British Isles is controversial in relation to Ireland, the alternate term Ireland and Britain is often used as a neutral term for the islands.