
The Aherlow River SAC is a designated conservation area in County Tipperary, Ireland, notable for its pristine river ecosystems supporting diverse flora and fauna, notably salmon and freshwater pearl mussels.
The Aherlow River SAC encompasses the stretch of the Aherlow River and its surrounding habitats in County Tipperary, Ireland. This Special Area of Conservation is designated primarily due to its excellent water quality and the presence of protected species such as the Atlantic salmon (Salmo salar), European otter (Lutra lutra), and critically important populations of freshwater pearl mussel (Margaritifera margaritifera). The SAC’s geography includes fast-flowing upland rivers, gravel beds, and riparian woodlands which combine to form a dynamic environment supporting a wealth of biodiversity. The Aherlow River, flowing through the Glen of Aherlow, is an important spawning ground for migratory fish, drawing anglers and nature enthusiasts alike. Its clear waters and surrounding landscape of rolling hills and pastoral lands offer scenic beauty and a peaceful setting rich in ecological value. Outdoor recreational activities are typically focused on angling, birdwatching, and low-impact hiking along riverbanks and nearby trails, with a strong emphasis on conservation and habitat protection. The SAC is a vital part of regional conservation efforts overseen under the EU Habitats Directive and Irish environmental law to ensure the persistence of rare and vulnerable species. Visitors are attracted by the combination of natural heritage, opportunities for sustainable fishing, and the tranquil rural backdrop of the Glen of Aherlow. Aside from wildlife, the area has cultural significance linked to traditional rural Irish life and the historical villages nearby, enhancing its appeal for eco-tourism and educational visits.
Crystal-clear waters supporting healthy Atlantic salmon runs
One of Ireland’s key habitats for the endangered freshwater pearl mussel
Scenic views of the Glen of Aherlow’s rolling hills from riverbanks
Quiet riverside spots ideal for birdwatching and observing otters
Pristine stretches of gravel riverbeds where salmon return each year to spawn, vital for sustaining local fish populations.
One of the few Irish rivers supporting populations of the critically endangered freshwater pearl mussel, requiring clean, oxygen-rich waters.
Dense riverbank vegetation offering shelter to European otters, a protected species indicative of healthy aquatic ecosystems.