Coumshingaun Lough to Mahon Falls

This point-to-point mountain outing links two of the Comeragh Mountains’ best-known features: the vast corrie of Coumshingaun Lough and the long plunge of Mahon Falls. At roughly 8 km / 5 miles with about 700 m / 2,300 ft of ascent, it is a serious hillwalk rather than a casual ramble, and the “Difficult” rating is well deserved. The route climbs quickly from the lower slopes above Kilclooney Wood, gains the open plateau, then crosses rough upland ground before descending toward the River Mahon and the falls. Expect steep gradients, exposed mountain terrain, boggy sections, loose rock, and the possibility of poor visibility even on otherwise decent days. The start is generally associated with Kilclooney Wood car park beside the R676, roughly midway between Dungarvan and Carrick-on-Suir, while the finish is at the Mahon Falls parking area near Mahon Bridge on the southern side of the range. (wildirishwalks.ie)

The opening climb is the most immediate test. From the Kilclooney side, the route leaves the woodland and quickly breaks onto open mountainside, where the ground steepens and the views begin to widen behind you toward the Waterford lowlands. This first section can feel relentless for the first 2 to 3 km / 1.2 to 1.9 miles as you gain most of the day’s height. Underfoot, expect a mix of path, heath, wet patches, and stony ground. In dry weather it is simply strenuous; in wet or windy conditions it becomes much more committing. The reward is one of Ireland’s most dramatic mountain landscapes: Coumshingaun Lough sitting in a glacial bowl beneath dark cliffs. The corrie itself is widely noted as one of the finest examples of its kind in Ireland, carved by Ice Age glaciation into a deep amphitheatre-like hollow. (visitwaterford.com)

Terrain and route character

Once above the lake, the walk changes character. Instead of a single steep pull, you move into broad upland country where navigation becomes more important than fitness alone. The Comeragh plateau sits around 700 m / 2,300 ft in places, and while the gradients ease, the terrain can be deceptively slow: peat hags, wet ground, faint trods, and stretches where the line is not always obvious. In mist, this is not a place to rely on guesswork. If you are planning the crossing, load the route in HiiKER in advance and be prepared to use it properly, because the plateau and the approaches to Mahon can become confusing when cloud drops. (npws.ie)

The middle section gives a strong sense of the Comeraghs as a high, open mountain block rather than a single viewpoint walk. You are moving between two distinct landforms: the enclosed corrie of Coumshingaun and the deeply cut valley of Coum Mahon. As you trend toward Mahon Falls, the ground begins to tilt southward and the drainage gathers into the River Mahon, which eventually spills over the escarpment in a dramatic cascade. Visit Waterford describes Coum Mahon as the hollow of the River Mahon, and the falls themselves drop about 80 m / 262 ft, making them a striking finish after the harsher upland crossing. (visitwaterford.com)

Landmarks, scenery, and what to watch for

Coumshingaun Lough is the headline landmark and the visual centerpiece of the day. The lake sits beneath cliffs that rise sharply above the water, with the corrie rim giving huge views across the basin and out toward lower country. This is a landscape of sandstone, glacial erosion, and abrupt relief, so the scenery feels rugged and architectural rather than gentle. Later, the route toward Mahon introduces a different mood: open moorland giving way to a river-cut valley and then the waterfall itself, where the mountain suddenly breaks downward. (byhookorbycrooke.com)

Nature is a major part of the walk. The Comeragh Mountains SAC includes upland habitats such as heath, blanket bog, rocky slopes, and lake environments, all of which support a distinct mountain ecology. Around the lower wooded and valley sections near Mahon, you may encounter