Magheraveely –Kilroosky Lake Cluster is a cluster of seven freshwater lakes and one wetland area located in Counties Fermanagh and Monaghan, straddling the border between Northern Ireland and the Republic of Ireland. Known as “Kilrooksy” in the RoI and Magheraveely in NI, the lakes are a specific type of lake known technically as “marl lakes”. Marl lakes are lakes with a loose clay and lime sediment bed which are fed by lime rich water and sit upon a layer of limestone rock.
Magheraveely-Kilroosky Lake Cluster is also notable for the marginal fen vegetation surrounding the lakes, with significant areas of sedges and herbs including several nationally scarce species. Several of the lakes also have strong populations of the endangered White-clawed crayfish, a species indicative of good water quality.