Ireland's limestone is full of holes, from show caves with electric light to flooded shafts only divers have seen. Its mountains drop water off their edges. Here are 22 caves and 15 waterfalls, with a length, depth or height only where the source gives one.
| Waterfall | County | Height | Note |
|---|---|---|---|
| Sruth in Aghaidh an Aird also the Devil's Chimney |
Sligo / Leitrim Dartry Mountains, above Glencar Lough |
150 m | Ireland's highest waterfall. The name means "stream against the height": southerly winds sometimes blow the water back up over the cliff. It flows around 200 days a year. Source ↗ |
| Powerscourt Waterfall Eas Chonaill |
Wicklow River Dargle, Powerscourt Estate |
121 m | Often called Ireland's highest; its own article now calls it the second highest, after Sruth in Aghaidh an Aird. It flows all year. Source ↗ |
| Mahon Falls | Waterford Comeragh Mountains |
80 m (main drop) | A series of cascades where the River Mahon falls off the Comeragh plateau into Coum Mahon. Source ↗ |
| Glenmacnass Waterfall Gleann Log an Easa |
Wicklow head of Glenmacnass, on the Military Road |
80 m | The Irish name means "the glen of the hollow of the waterfall". Source ↗ |
| Torc Waterfall Easach Toirc |
Kerry Killarney National Park |
20 m (110 m long) | "Cascade of the wild boar", formed by the Owengarriff River draining from the Devil's Punchbowl on Mangerton. Source ↗ |
| Glencar Waterfall | Leitrim north shore of Glencar Lough |
· | Feeds Glencar Lough, and is the waterfall in Yeats's poem The Stolen Child. Source ↗ · The poem ↗ |
| Poulanass Waterfall | Wicklow Glendalough |
· | The Poulanass River plunges into the valley here; its delta divided the original lake of Glendalough in two. Source ↗ |
| Ess na Larach | Antrim Glenariff Forest Park |
· | A waterfall on the Glenariff River. Source ↗ |
| Aasleagh Falls Eas Liath |
Mayo near the mouth of the Erriff |
· | "Grey waterfall", on the Erriff River. Source ↗ |
| Toormakeady Falls | Mayo Toormakeady, by Lough Mask |
· | In the Toormakeady Gaeltacht, between Lough Mask and the Partry Mountains. Source ↗ |
| Clare Glens | Tipperary / Limerick Clare River |
· | A wooded glen with a waterfall known as the Big Eas, and rapids kayakers run. Source ↗ |
| Largy Waterfall | Donegal Largy, west of Killybegs |
· | A small coastal waterfall, popularly called Donegal's Secret Waterfall. Source ↗ |
| Ennistymon Cascades | Clare Ennistymon |
· | Small rapids on the River Inagh behind the main street, where the river becomes tidal. Source ↗ |
| Mullinhassig Waterfall | Cork Mullinhassig Wood, near Aghavrin |
· | A waterfall of about 18 feet in Mullinhassig Wood. Source ↗ |
Assaroe Falls (Eas Aoidh Ruadh), Donegal. No longer there. Named by tradition for Aodh Ruadh, who drowned in it, the fall and its salmon leap were lost when the Erne was diverted for the Cathaleen's Fall power station in the late 1940s and early 1950s. Wikipedia ↗
Sruth in Aghaidh an Aird, on the Sligo–Leitrim border above Glencar Lough, at 150 metres. Powerscourt Waterfall in Wicklow, at 121 metres, is often called the highest, but its own Wikipedia article now calls it the second highest.
Pollnagollum–Poulelva in the Burren, County Clare, with over 16 km of passages. The longest in Northern Ireland is the Marble Arch Caves system in Fermanagh, at 11.5 km.
Reyfad Pot in County Fermanagh, 193 metres deep, according to Wikipedia's list of Irish caves. The deepest explored underwater cave is Pollatoomary in County Mayo, dived to 120 metres.
No. It is named after Mitchelstown in County Cork but lies near Burncourt in County Tipperary, about 12 km away.
Each entry comes from its English Wikipedia article (October 2026), linked beside it; lengths, depths and heights are the article's own, in the units it uses. Cave lengths change as cavers find more passage, so treat them as the figure at the time of writing. An Irish name is shown only where the source gives one.
Not included, because we found no source to check them against: Assaranca Waterfall, near Ardara, County Donegal; Glenevin Waterfall, near Clonmany, County Donegal; Gleninchaquin waterfall, Gleninchaquin Park, County Kerry. They are real and well visited, but a height or a story without a source is not something this site prints.
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