Overview
The Leannan (Irish: An Leanainn) runs about 46 km (28.5 miles) across County Donegal, from the Glendowan Mountains down to Lough Swilly. On the way it feeds Lough Gartan – remembered as the birthplace of St Colmcille around 520 – and the trout-rich Lough Fern, then passes through Kilmacrennan before reaching the heritage town of Ramelton, where it empties into the sea. It’s a Special Area of Conservation (site code 002176), protected for its clean, well-oxygenated water and the salmon, otters and freshwater pearl mussels that depend on it. If you’re not fishing, the stretch worth walking is at Ramelton, along the old quays.
Angling on the Leannan
The Leannan has been a Donegal fishing river for generations. It’s known first as a brown trout fishery, and the stretch below Lough Fern is especially good over its gravel beds and shaded pools. Salmon stocks were hit hard by an outbreak of ulcerative dermal necrosis (UDN) in the 1970s and have been rebuilding since; the river’s records include a salmon of 33 lb. Salmon start running from early January, with the grilse arriving around June.
The conservation rules are strict: barbless hooks are mandatory, and catch-and-release is strongly encouraged for salmon and sea trout. You’ll need an inland fishing licence, and some stretches need a permit on top of that. For the water around Kilmacrennan, contact Kenneth Bradley (074 9153736) or the Spar shop in Kilmacrennan for current arrangements, water levels and prices.
Wildlife and conservation
The SAC status is earned. The clean, fast water upstream of Kilmacrennan suits the freshwater pearl mussel, a rare bivalve that only survives in near-pristine rivers and is one of the clearest indicators of water quality you’ll find. Otters work the quieter, peat-stained stretches near Gartan, and herons and kingfishers patrol the banks. The protected slender naiad, an aquatic plant, grows in the system too – another reason the Leannan carries its designation.
Walking and heritage
The best walking is at the river’s mouth. Ramelton’s riverside quays are lined with tall stone warehouses from the town’s linen-trade heyday in the early 1800s, when the port shipped cloth out to Britain; the channel silted up by the mid-19th century and the trade faded, but the buildings remain, now in community and heritage use. The Ramelton Scenic Walk follows the estuary with views down Lough Swilly. Upstream, a short walk from the Drummonaghan Woods car park leads to a small waterfall on the river. The Leannan has shaped local life for centuries, and its upper reaches at Gartan are tied to the beginnings of St Colmcille’s story around 520–521.
Seasonal highlights
- Winter and early spring (January–May): salmon start running from early January, and spring is the traditional fishing period, with the river’s flow usually at a workable level.
- Summer (June–August): the grilse arrive around June, brown trout are active in the cooler shaded pools, and the long evenings suit riverside walks and birdwatching.
- Autumn (September–October): falling water levels leave calm, reflective pools while the surrounding woodland turns to gold – the lower banks are at their most photogenic.
- Winter: fishing slows, but the river stays a quiet route for walkers. Look for otter spraints and tracks along the muddy banks after steady rain.
Practical information
The Leannan is freely accessible along most of its length, with no entry fee for walking or wildlife viewing. Public parking is available in Kilmacrennan and Ramelton, and at the Drummonaghan Woods access point near the waterfall. Anglers need an inland fishing licence, and specific stretches may need a permit from a local fishery association or private owner (see the contacts above). Check current water conditions and regulations locally before heading out. The river is best reached via the R245, which runs alongside it between Letterkenny and Ramelton.
Nearby attractions
A visit to the Leannan pairs naturally with the towns and country along its course:
- Ramelton – the heritage town at the river’s mouth, with Georgian streets and the warehouse-lined quays.
- Letterkenny – Donegal’s largest town, upstream on the R245.
- Gartan and Glenveagh – Colmcille’s birthplace on the upper river, with Glenveagh National Park beyond to the west.
- Rathmullan – on the shore of Lough Swilly a short drive north, with its beach and Flight of the Earls history.
Come on a weekday morning and you’ll likely have the Ramelton quays and the fishing pools largely to yourself.