Cuilcagh, historically Slieve Cuilcagh (from Irish: Sliabh Chuilceach/Binn Chuilceach, meaning "chalky mountain/chalky peak"), is the highest mountain in the Breifne area and the 165th highest on the island of Ireland . The summit lies on the border between County Fermanagh (in Northern Ireland) and County Cavan (in the Republic of Ireland), and is the highest point in both counties. Water from the southern slope flows underground until it emerges some miles away in the Shannon Pot, the traditional source of the River Shannon.
Read more about Cuilcagh: Flora and Fauna, Geopark, Ramsar Site, History