About the Sillees River
The Sillees River (Irish: An tSileas) is a defining waterway in south-west County Fermanagh. Rising from Lough Ahork within the Lough Navar Forest, the river travels approximately 30 kilometres through a landscape of drumlins, glens, and limestone scarps. Its course passes the village of Derrygonnelly, cuts through the rolling countryside of Boho, and meanders past the twin lakes of Carran and Ross Lough before joining Lower Lough Erne. Along the way, it collects water from tributaries including the Boho River and the Screenagh stream, creating a corridor of quiet natural beauty that is increasingly recognised for both its wildlife and its geological significance.
Walking the Correl Glen Trail
The most accessible way to experience the river is the Correl Glen nature trail. Starting from the free car park opposite Falls Bridge (grid reference H074547), this circular route covers roughly 0.8 miles and is well-suited for a relaxed walk. The path follows the river through damp, shaded woodland before rising onto heathland. From the higher ground, walkers get clear views across the Fermanagh Scarplands and down to Carrick Lough.
Two interpretation panels along the route provide context on the area’s geology and local history. The terrain is off-road and uneven in places, so sturdy footwear is recommended. Families with older children will find the moderate footing manageable, but the trail is not suitable for wheelchairs. The woodland floor often hosts filmy ferns that thrive in the moist micro-climate, while spring and early summer bring a variety of butterflies, including the Holly Blue and the Speckled Wood.
Wildlife and Wetlands at Ross Lough
Further downstream, the river shapes the landscape around Ross Lough, a hollow among drumlins that now functions as a rich wetland reserve. Historical drainage works lowered the water table here, inadvertently encouraging a diverse mix of swamp, fen, and wet meadow habitats. This mosaic supports a variety of plants, including alder, willow, yellow flag iris, and the rare mudwort, which flowers from June to October.
Birdwatchers often spot kingfishers darting along the riverbanks and sedge warblers moving through the tall reeds. The area is freely accessible, and the quiet boardwalks allow for close observation of the flora without disturbing nesting birds. Early morning visits are particularly rewarding, as mist often settles over the water and surrounding woodlands, creating a calm atmosphere for photography and quiet reflection.
Folklore and Ancient Fossils
The Sillees carries a reputation that stretches back to early Christian times. Local tradition holds that St Faber cursed the river after altering its course, famously declaring the water “bad for fishing and good for drowning”. This dark legend was bolstered in the 18th century by tales of the highwayman Black Francis Corrigan, who was said to have leapt the river on horseback after a robbery. In Celtic belief, rivers often served as boundaries to the Otherworld (Aos Sí), and the Sillees’ reputation as a liminal space persists in local storytelling.
Beneath the folklore lies a scientific treasure trove. The river corridor is a proposed Area of Special Scientific Interest (ASSI) due to its Carboniferous limestone exposures. These rocks contain an exceptional assemblage of silicified fossils, including over 56 species of early Carboniferous brachiopods and 69 species of bryozoans. At least one species has been named after the river, making it a site of genuine interest for geology enthusiasts. Local geology societies occasionally organise guided walks to highlight these outcrops and explain the river’s role in the ancient Carboniferous marine environment.
Practical Information
Getting there – The Falls Bridge car park is signposted from the A46 and B82 junctions near Lough Navar Forest Drive. Spaces are limited, so early arrival is advised on weekends and during peak walking seasons.
Public transport – The nearest town is Derrygonnelly, less than a mile from the trailhead. Translink bus services connect the village with Enniskillen and other regional centres; check the Translink journey planner for current timetables.
Facilities – There are no toilets at the Falls Bridge car park, though a bench and litter bins are provided. Derrygonnelly offers public toilets, a café, and a pub within walking distance.
Safety and River Levels – The Sillees is prone to flooding after heavy rain, particularly in the Boho area. The Department for Infrastructure regularly maintains the watercourse, but visitors should always check the latest flood warnings on the Fermanagh and Omagh District Council website before heading out. Avoid walking close to the riverbanks when water levels are high or after prolonged rainfall.
Nearby attractions – After a walk along the Sillees, consider visiting Tully Castle, located just 3.4 miles away, or explore the neighbouring Aghinrawn River for another scenic riverside route.
The best time to spot the Silver-washed Fritillary, Ireland’s largest butterfly, is late spring when the sun warms the Correl Glen heathland. Arriving in the early morning also increases the chances of catching the river shrouded in mist, offering a peaceful way to witness this quiet stretch of Fermanagh.