Lists of mountains in Ireland are 27 Irish County Tops, as 10 counties share the same county top, namely: Galtymore for Limerick/Tipperary, Mount Leinster for Carlow/Wexford, Sawel for Londonderry/Tyrone, Cuilcagh for Cavan/Fermanagh, Arderin for Laois/Offaly. Whereas the MountainViews, Vandeleur-Lynam, and Arderin classifications are unique to Ireland, Irish mountains appear in other similar classifications that have been used in across Britain and Ireland. The Britain and Ireland Simms classification (height over 600 m, and prominence above 30 m), is very similar to the Irish Arderin classification (height over 500 m, and prominence over 30 m). , the 2,754 Simms in Britain and Ireland, which include 224
County Offaly out across the county with the Bog of Allen extending into four other counties. The county consists of approximately 42,000 hectares of peatlands which is 21% of Offaly's total land area. Offaly contains approximately of forest and woodland area, which only amounts to 4.5% of the county's land area. This includes woodlands within the Slieve Blooms and the Lough Boora Parklands. Roughly 75% of Offaly's forested area is Conifer High Forest. The following are the historical baronies located in County Offaly: One of the earliest known settlements in County Offaly is at Boora bog which dates back to the Mesolithic