Clogherbog and Lough Acrottan () in Glenkeel. There are two other lakes associated with older parish boundaries, those of Carran and Ross Loughs. Lough Nacloyduff (meaning the lake of the Dark Pit or digging) is about in surface area. To the north on Knockmore Mountain are some yellow sandstone cliffs which contain "the lettered caves". These three caverns, two of them artificial in appearance, include oghamic style writing on their walls, consisting of crosses and star like shapes inside rectangles. November 2009 flooding The Boho is also prone to regular flooding. One of the most recent events was in November 2009. With water in Lough Erne at its highest level since records began, the Sillees River, which flows through the parish, burst its banks causing traffic disruption for several days. The flooding affected Corr Bridge, Drumaraw, Muckenagh, Carran Lake, Samsonagh and Mullygarry. Killyhommon Primary School had to be closed as drivers struggled to negotiate floods. Flora and fauna Flora As a consequence of the local geology and low intensity farming practices, the Boho area has a high biodiversity of floral habitat types that is almost unparalleled in the whole of Northern Ireland as evidenced by the number of Areas of Special Scientific Interest, provisional ASSI's (pASSI), candidate Special Areas of Conservation (cSAC) and proposed Areas of Outstanding Natural Beauty (pAONB). These range from open freshwater lakes to high calcareous grasslands and upland bogs. Fen meadow is a classic Boho habitat type, consisting of wet fields locally described as a bog meadow, typified by the species devil's-bit scabious, bog thistle, sedges and occasionally tormentil, purple moor grass and rushes (Juncaceae). In Northern Ireland, this type of terrain only covers 0.4% of the total land area and has decreased by 18% over the last ten years mainly due to the 21% decrease in Fermanagh coverage. In more upland areas, drier habitats include calcareous grassland, which is very rare in a Northern Ireland context covering only 0.1% of the total land area, and which in only ten years, between 1990 and 2000, underwent a 7% decrease in coverage. Calcareous grassland is species rich, typified by blue moor-grass, wild-mountain thyme, lady's bedstraw, fairy flax and lady's-mantle as well as fescue grasses, sweet vernal grass, bent grass, crested dog's-tail grass, carnation sedge Cyperaceae and devil's-bit scabious on the thin layer of soil which covers the limestone rock. Within this type of habitat, limestone pavement can