Counties of Ireland or between the three counties in the Dublin area. This system usually results in more populated counties having several constituencies: Dublin, including Dublin city, is subdivided into twelve constituencies, Cork into five. On the other hand, smaller counties such as Carlow and Kilkenny or Laois and Offaly may be paired to form constituencies. An extreme case is the splitting of Ireland's least populated county of Leitrim between the constituencies of Sligo–North Leitrim and Roscommon–South Leitrim. Each county or city is divided into Local electoral areas for the election of councillors. The boundaries of the areas and the number of councillors
County Offaly Mountain which are the county's second and third highest peaks. Croghan Hill rises from the Bog of Allen and is located in northern Offaly. Although only 234 metres high, it is known for its view over the surrounding area and it stands out by itself. The floodplain of the River Shannon is in the north-western part of the county. The River Camcor runs through the town of Birr and is a Wild Trout Conservation Area. The River Brosna runs across the county from Lough Owel in Westmeath to Shannon Harbour. Silver River runs through several towns in the south of