From car parking beside the Owenrigh River follow the surfaced road past the gate and old filter house up the steep Glen (rising 400ft). Fork left up Altnaheglish Glen and cross the bridge where the Altnaheglish River and Glenedra Water meet. A legendary serpent that escaped St Patrick allegedly inhabits the pools here! Continue, crossing another bridge to view Banagher Dam and Altnaheglish Reservoir, flanked by moorland and conifer plantation. Return by the same route. Part of an Area of Special Scientific Interest (ASSI) and Special Area of Conservation (SAC) managed by Environment and Heritage Service, the Glens' steep slopes support oak and ash woodland with rowan, hazel, hawthorn and holly trees understorey. Ferns and mosses thrive in damp, shady spots. Primroses, blue bells, wood sorrel and wood anemone carpet the woodland floor in spring, while birdsong fills the woodland in summer. Listen for wood warblers, watch for circling buzzards, or glimpse a squirrel, stoat, or silver-washed fritillary butterfly. To protect the fragile soils and delicate flora of the steep slopes, walkers are asked to keep to the roadway.