Cuilcagh is a mountain on the border between County Fermanagh and County Cavan . With a height of 665 metres it is the highest point in both counties and the 165th highest on the island of Ireland. Water from the southern slope flows underground until it emerges some miles away in the Shannon Pot, the traditional source of the River Shannon.
The name Cuilcagh comes from the Irish Cuilceach, which has been translated as "chalky". However, the mountain is mainly sandstone and shale, covered with bog and heather. "It is possible that the name refers to the limestone rock on the lower northern flanks. Here a number of streams disappear below ground at swallow holes named Cats Hole, Pollawaddy, Pollasumera and Polliniska, all forming part of the Marble Arch cave system. If so, the name would mean 'calcareous' rather than 'chalky'". It has also been called Slieve Cuilcagh in English, 'Slieve' being an anglicisation of Sliabh .
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