Overview
Mangerton is a big, broad bog dome, not a rocky peak. At 838 m it’s the highest mountain lying entirely within Killarney National Park, in County Kerry, and where MacGillycuddy’s Reeks next door are all ridge and rock, Mangerton is soft, spongy blanket bog underfoot the whole way up. The Irish name, An Mhangarta, is usually read as ‘the long-haired mountain’, though some trace it to mangartach, ‘quaking’ or ‘moving’ – a fair description of the wet ground on its southern slopes.
If you only want the highlight, don’t chase the summit. The out-and-back to the Devil’s Punchbowl gives you the mountain’s one great sight – a dark corrie lake in a cliff-ringed bowl – without the featureless plateau beyond. The trig point is for people ticking off a list.
Walking routes
The standard trailhead is the Mangerton Mountain car park off Mangerton Road, a signed turn about 6 km south-east of Killarney town (there’s a smaller alternative parking area at Gortagullane, and Upper Torc is also used). From the car park a worn track climbs steadily onto the open mountain. Three options:
- Out-and-back to the Punchbowl (about 9.9 km, ~3 hours): the shorter, better-value walk – straight up to the corrie and back for the same headline view.
- Summit loop (about 10 km, 4–5 hours): climbs past the Punchbowl, crosses the boggy plateau to the trig point, and returns.
- Mangerton Circular (about 14 km, ~4.5 hours): the long way round, taking in Horse’s Glen and its lakes – strenuous, and only worth it in clear weather.
Paths are marked with cairns and way-markers, but the plateau is open and featureless, so carry a map and compass and know how to use them. A downloadable GPX helps; it doesn’t replace navigation.
The Devil’s Punchbowl and the glacial lakes
At around 670 m, the Devil’s Punchbowl (Poll Ifrinn) is the mountain’s defining feature – a deep, oval corrie gouged out by Ice Age glaciers, holding a dark, still lake that spends a lot of its time under low cloud. Its outflow feeds the Owengarriff River, which drops over Torc Waterfall to the Lakes of Killarney below.
Three more glacial lakes spill from the corries into Horse’s Glen: Lough Garagarry, Lough Mannagh, and the hanging Lough Erhogh, perched in a shelf above the others. The plateau in between is Devonian sandstone under a thick skin of blanket bog, all tussock and peat hags. In poor visibility it’s genuinely disorienting, which is the honest caveat for this hill: Kerry Mountain Rescue is called out here more than once a season, usually to walkers who lost the track in cloud. There’s a mountain-rescue advice board at the trailhead – read it.
History and legend
The far northern flank holds the Tooreencormick battle site (Tuairín Cormaic), a 13th-century clash between the Mac Cárthaigh and the Anglo-Norman FitzGeralds, marked now by a stone monument.
The folklore is better fun. One tale has the chieftain O’Donoghue Ross dining with the Devil on the mountain; after a row, O’Donoghue punched him and bolted, and the Devil bit a chunk out of the summit and flung it after him. The chieftain ducked, the rock sailed on and landed in Tipperary as the Rock of Cashel, and the hole it left filled to become the Punchbowl. Another story makes the corrie a hiding place for the lovers Diarmuid and Gráinne.
Wildlife
Above the treeline the bog carries butterwort, bog violet and dwarf willow, with heather and gorse colouring the lower slopes in summer. Ravens, kestrels and peregrine falcons work the air over the corries. Best of all are the deer: herds of red and sika deer graze the higher ground, often in plain sight from the track, and during the autumn rut you can hear stags roaring across the plateau.
Practical information and safety
- Parking: Free at the Mangerton Road car park, year-round. No public transport to the trailhead – it’s a taxi from Killarney or your own car.
- Facilities: None on the mountain. Carry water, food and layers.
- Gear: Waterproof boots are non-negotiable on this ground, plus waterproofs, a warm layer and a head-torch. Mobile signal on the summit is unreliable.
- Dogs: Welcome on a lead, to protect livestock and nesting birds.
- Weather: Conditions turn fast – mist, wind and a sharp drop in temperature. Start early, share your route, and turn back if the cloud comes down.
Nearby
Coming off the hill, the Old Kenmare Road links back to Killarney’s main sights. Torc Waterfall, fed by the Punchbowl’s outflow, is a two-minute stop near the road. For a quieter follow-on, the Black Valley has low woodland walks, or drop into Beaufort for coffee and supplies.
Do the Punchbowl out-and-back on a clear afternoon, when the cloud tends to lift off the plateau, wear proper boots, and give it three hours. The dark lake in its bowl of cliffs is the whole point of the walk – everything above it is a bonus.