Overview
The Seven Sisters ridge is a defining feature of the Derryveagh Mountains in County Donegal. Running north-south, this dramatic chain strings together seven distinct peaks: Muckish (666 m), Crocknalaragagh (471 m), Aghla Beg (602 m), Ardloughnabrackbaddy, Aghla More (581 m), Mackoght (Little Errigal), and the iconic Errigal (751 m). The ridge transitions from the rugged limestone outcrops of Muckish in the north to the steep quartzite slopes of Errigal in the south, crossing open bogland, heather-clad plateaux, and loose scree fields. It is one of the most recognised skylines in the province, visible for miles across the Donegal Highlands.
The Traverse: Route & Terrain
The classic Seven Sisters traverse covers approximately 21 km and typically takes around nine hours to complete, depending on fitness and weather conditions. The route demands a solid level of endurance, with a total ascent of 1,671 m and a descent of 1,787 m. Walkers usually start at the Miners Path car-park near Muckish and finish at the Errigal car-park, moving in a south-westerly direction.
The trail is unsignposted and follows a mix of old sheep paths, faint ridgelines, and exposed scree slopes. The climbs to Aghla Beg and the final push to Errigal are notably steep and can be taxing on the legs. After descending from Aghla More, the route dips into the sheltered valley of Altan Lake. Here, the stone ruins of Altan Farm sit quietly on the shoreline, offering a practical rest stop and a popular spot for experienced wild campers splitting the trek over two days.
Summit views are extensive. From the higher points, walkers can look north toward the Atlantic, south toward the Donegal Bay coastline, and east across the rolling foothills of the Derryveaghs. Each peak offers a distinct vantage point, with cairns and trig points marking the summits of Aghla Beg and Aghla More.
History & Gaelic Heritage
The landscape carries centuries of local history. The Miners Path at the northern start follows routes once used by slate-quarry workers and shepherds moving livestock across the uplands. The Irish name for Muckish, An Mhucais, translates to “the pig’s back,” referring to its broad, table-top summit that supposedly resembles a resting pig when viewed from the north-west. Errigal, or An Earagail, stands as Donegal’s highest peak and has long served as a navigational landmark for coastal communities.
Gaelic place-names across the ridge reflect its agricultural and pastoral past. Aghla derives from Aghlas, meaning “hill,” while An Eachla Mhór (Aghla More) translates to “the great lookout point.” The surrounding townland of Knockfadda, near An Cnoc Fada, contains the remains of two 19th-century stone forts, evidence of long-standing settlement and land management in the area. Droving routes once criss-crossed these slopes, connecting inland farms to coastal markets.
Practical Information & Safety
This is a serious mountain walk that requires careful preparation. Because the route is not signposted, navigational competence is essential. Carry a detailed OS map (OSi50), a compass, and a fully charged phone or GPS device. The terrain can become boggy and wet underfoot, particularly after rain, so sturdy hiking boots with good ankle support are non-negotiable.
Weather in the Derryveaghs shifts quickly. Low cloud cover can reduce visibility to near zero, and wind speeds increase significantly on exposed ridges. Pack waterproof layers, a warm mid-layer, a head torch, and enough food and water for a full day. Mobile signal is patchy across most of the traverse; inform someone of your route and expected return time before setting off. In an emergency, dial 999 or 112 to reach the Gardaí, who coordinate with the Donegal Mountain Rescue team.
The best walking conditions typically occur from late spring through early autumn. Summer afternoons can bring sudden thunderstorms, so starting early is advisable. Always close gates behind you, respect private land boundaries, and follow Leave No Trace principles.
Getting There
The Seven Sisters are best accessed by private vehicle. The R256 road runs directly through the heart of the Derryveagh Mountains, connecting Letterkenny to Falcarragh. The northern trailhead at the Miners Path is located just off this route, while the Errigal car-park lies a few kilometres further south. Public transport options to the trailheads are extremely limited, so a car or organised transfer is recommended.
Letterkenny, roughly 30 km to the south, serves as the main supply base for fuel, groceries, and accommodation. If you are planning a longer trip through the region, the nearby Bluestack Mountains offer additional walking routes and a contrasting landscape of rounded hills and deep glens. Check tide times and weather forecasts before heading out, and allow ample daylight for the return journey.