Ireland is an island in northwest Europe in the north Atlantic Ocean whose main geographical features include low central plains surrounded by a ring of coastal mountains.
The Republic of Ireland is divided into 30 administrative regions, mostly tied to the 26 constituent counties (county Tipperary is divided in two and county Dublin in four).
The predominant religion in Ireland is Christianity, with the largest church being the Roman Catholic Church. Ireland's constitution states that the state may not endorse any particular religion and guarantees freedom of religion.