Overview
Pollnagollum (also spelled Poulnagollum), often called Pollnagollum of the Boats, is a spectacular limestone stream‑passage cave in the heart of Belmore Forest, County Fermanagh. At over 16 km in length it is the longest cave on the island of Ireland and the third deepest in the state. A dramatic 12‑metre waterfall tumbles over a sheer limestone cliff before vanishing into the cave mouth, then travels roughly 1.8 km underground to re‑emerge on the north bank of the Aghanaglack River. The striking entrance served as the exterior of the Brotherhood Without Banners’ hideout – “Hollow Hill” – in Game of Thrones season 3.
History / Background
The name Poll na gcoll means “hole of the doves”, and folklore links the site to Celtic myth as a portal to the Otherworld. Archaeological hints suggest prehistoric peoples used the cave for shelter. Modern exploration began in 1880 when T. J. Westropp reached the Main Junction. Systematic surveys followed:
- 1912 & 1925 – E. A. Baker’s expeditions
- 1935 – Yorkshire Ramblers’ Club descended the Poulelva pot
- 1944 – Royal Irish Academy survey by J. C. Coleman and N. J. Dunnington
- 1952 – RAF cavers discovered Branch Passage Gallery
- 1960s – University of Bristol Spelaeological Society completed the final kilometres These efforts have made Pollnagollum a favourite training ground for beginner cavers, thanks to its extensive network of winding stream passages and multiple entrances.
What to See & Do
- Viewing platform – A short stone‑slab stair descent from the car park leads to a safe overlook where the waterfall plunges into the cave mouth. Interpretive panels explain the geology, hydrology and folklore.
- Forest walk – The official Pollnagollum Cave Walk is a 4.5‑mile (7 km) anti‑clockwise loop taking about 2 hours. The trail weaves through Belmore Forest, passes the historic Coolarkan Quarry, and offers panoramic views of Cuilcagh Mountain, Lower Lough MacNean and the television masts on Brougher Mountain.
- Geological insight – Along the route, panels describe the karst processes that formed the cave and its role within the Marble Arch Caves Global Geopark.
- Game of Thrones fans – Spot the exact location used for the Brotherhood’s hideout and, on the nearby Journey of Doors trail, collect a stamp at the Game of Thrones door in Enniskillen.
- Guided caving tours – Local spelunking clubs arrange tours into the deeper passages, showcasing stalactites, stalagmites and flowstones. Interior access is only recommended with a qualified guide due to the active stream.
Nearby Rivers & Angling
The Aghanaglack River, which re‑emerges from the cave’s underground stream, is a popular spot for trout fishing. Anglers also frequent the nearby Aghinrawn River, celebrated for its clear waters and scenic banks. The region’s reputation for quality angling is highlighted each year by the Fermanagh Fishing Classic, a flagship event that draws hundreds of competitors to the county’s waterways.
Nearby Events
Fermanagh Fishing Classic – Held each May, this 49‑year‑old competition showcases the district’s rivers, including the Aghanaglack and Aghinrawn. Visitors can combine a day of fishing with a walk at Pollnagollum, making the most of the county’s natural attractions.
Getting There
Pollnagollum lies on the R200 road, about 6 km north‑west of the village of Boho. From Enniskillen follow the A46 to the junction for Boho, then continue on the R200 signs for “Pollnagollum”. The car park is a short turn‑off just before the forest edge.
- By car – There is free, 24‑hour parking at the lay‑by. The route is well‑signed and suitable for standard vehicles; larger coaches may need to use the larger lay‑by at the Belmore Forest visitor centre.
- Public transport – Bus services from Enniskillen to Boho run several times daily; the stop is a 10‑minute walk to the trailhead. No direct train service reaches the site.
- Cycling – The R200 is a low‑traffic road popular with cyclists; the forest loop is also accessible via a gravel track suitable for mountain bikes, though the stone steps to the platform are not bike‑friendly.
Seasonal Tips & Safety
- Best time to visit – Late spring to early autumn offers dry forest paths and vivid foliage. Winter walks are possible but the trail can be slippery and the waterfall may freeze, reducing visibility.
- Daylight only – Although the site is technically open 24 hours, the viewing platform and forest walk are safest in daylight. The area is unlit after dark.
- Footwear – Sturdy walking shoes with good grip are recommended; the stone steps can be wet after rain.
- Weather – The waterfall can create mist; a waterproof jacket is advisable.
- Safety – Stay on marked paths, keep children close to the railings at the platform, and do not attempt to enter the cave without a qualified guide.
Practical Information
| Item | Details |
|---|---|
| Opening hours | Open 24 hours (walks recommended daylight only) |
| Admission | Free (parking charges may apply) |
| Distance (walk) | 4.5 mi / 7 km loop |
| Estimated time | 2 hours |
| Difficulty | Easy – suitable for families and casual walkers |
| Terrain | Forest track, surfaced footpaths; stone steps to the platform |
| Wheelchair access | No – steps to the platform |
| Parking | Small lay‑by car park near the trailhead; free, 24 h access |
| Dogs | Allowed on lead; owners must dispose of waste |
| Map reference | OSNI Sheet 17 (Lower Lough Erne) |
| Phone | +353 71 9853692 |
Nearby Attractions
- Belmore Forest – The wider forest offers additional walking routes and a visitor centre. [/belmore-forest/]
- Ballintempo Forest – A short drive north brings you to the Aghanaglack River walk and historic quarry sites. [/ballintempo-forest/]
- Aghanaglack – Tomb and River Highlights – Explore the dual‑court tomb and riverside scenery just a few kilometres away. [/aghanaglack-dual-court-tomb/]
- Marble Arch Caves Global Geopark – The geopark headquarters at Mill Creek provide guided tours of the spectacular underground river system. [/marble-arch-caves/]
- Cuilcagh Boardwalk Trail – For a more challenging hike, the boardwalk trail across the Cuilcagh plateau offers sweeping views of the surrounding countryside. [/cuilcagh/]
Enjoy the blend of natural wonder, mythic history and pop‑culture fame that makes Pollnagollum a memorable destination in Northern Ireland.