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The island's main geographical features include low central plains surrounded by coastal mountains.
The highest peak is Carrauntoohil (Irish: ), which is 1,041 meters (3,415 ft) above sea level.
While some have argued for an origin in marine planation others regard these surfaces as peneplains formed by weathering and fluvial erosion.
Not only is their origin disputed but also their actual extent and the relative role of sea-level change and tectonics in their shaping.
360.5 km (224.0 mi) The longest river in Ireland, it separates the midlands of Ireland from the west of the island.
Hag's Head is another headland further up Clare's north/western coastline, with the Cliffs of Moher along the coastline north of the point.
The western coastline is rugged, with many islands, peninsulas, headlands and bays.
The island is bisected by the River Shannon, which at 360.5 km (224 mi) with a 102.1 km (63 mi) estuary is the longest river in Ireland and flows south from County Cavan in Ulster to meet the Atlantic just south of Limerick.
Erris Head is the northwesternmost point of Connacht.
Some of the next largest islands are the Aran Islands, off the coast of southern Connacht, host to an Irish-speaking community, or Gaeltacht.