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 Cavan springs near Bailieborough; the River Annalee which flows from Lough Sillan and joins the Erne; and the Cladagh river which rises from Cuilcagh and flows into Fermanagh. The Glyde and the Owenroe also source in Cavan. Cavan is known as 'The Lakeland County' and is reputed to contain 365 lakes. At , Lough Sheelin is the county's largest lake; it is situated in the south of the county and forms a three way border on its waters between counties Meath, Westmeath and Cavan. A large complex of lakes form in the north and west of Cavan into designated Specially Protected