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The remote lake-island site in Lough Derg in County Donegal is a temporary hell.
Centuries of fasting, barefoot prayer and sleepless vigil still shape this remote island pilgrimage—here’s what modern Lough Derg pilgrims say makes it the world’s toughest.
After listening to seasoned pilgrims and Lough Derg staff, I now understand why the three-day Lough Derg Pilgrimage has earned its reputation as the toughest pilgrimage in the world—a phrase even a 1985 news reporter used.
The three-day Lough Derg Pilgrimage, following a 1,000-year-old tradition of strict fasting, round-the-clock vigil and barefoot prayer, is said to be among the hardest pilgrimages in the world.
But I’ve fasted before; I even pulled dozens of all-nighters studying at the university. I’ve walked 942 miles/1515 km on my longest pilgrimage—admittedly not in bare feet. So what could make the Lough Derg Pilgrimage so widely hailed as the Toughest in the World? I visited tiny Station Island in the middle of a County Donegal lake to find out.
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A Bit of History Behind the Lough Derg Pilgrimage
Related reading: How to Find the Walking Tour in Ireland That is Right for You
In the 12th century, pilgrims believed that a pilgrimage to Lough Derg—also known as St. Patrick’s Purgatory—provided a privileged glimpse of the afterlife. Monks locked solitary pilgrims in a cave so small they had to crouch there for 24 hours. Pilgrims came from across Europe for the cave experience, where they believed they could see the gates of hell. Many thought this ordeal offered a spiritual “get-out-of-jail-free card,” unless they later committed a grievous sin. The horrific experience of witnessing hell would, they believed, deter future wrongdoing.
Medieval manuscripts describe St. Patrick’s Purgatory in striking detail, and high-status knights recorded their journeys to this island with its cave marking the entrance to purgatory. The site appears on many medieval world maps and maps of Ireland.
1714 St. Patrick’s Purgatory Map Key
a. Purgatory Hole
b. The Bed or Circle of St. Bridget
c. The Bed or Circle of St. Catherine
d. The Bed or Circle of St. Brendan's
e. The Bed or Circle of St. Patrick
f. The Bed of the Saints Abogi & Molaisci
g. The Bed or Circle of St. Columb
What Today’s 3-Day Lough Derg Pilgrimage Looks Like
Not many pilgrimages begin with a water crossing, but the Lough Derg Pilgrim steps first into a small enclosed ferry. “The crossing highlights the sense of coming away—or coming apart from the world,” Father Laurence Flynn, prior of Lough Derg, told me. The slow approach builds anticipation for the Lough Derg Pilgrim.
As the ferry bobbed toward the stone buildings on the island, nature set the scene for what almost looked like a peaceful retreat: blue waters lapping gently, green hills calming whatever inner storm the Lough Derg Pilgrim might be carrying.
“It’s not dramatic scenery, it’s understated—low hills, out of the way, a tiny corner of God’s creation, a phrase I find myself saying occasionally,” he smiled.
“Once you set foot on the island, you leave everything behind, even if for a short while,” confirmed a three-day Lough Derg Pilgrim. Her angelic smile said it all. Could this really be the prelude to the “Toughest Pilgrimage in the World?”
RELATED: Tasting Donegal: A Self-Guided Food Tour to the Best Places to Eat in Donegal
How the Lough Derg Pilgrim Begins the Journey
For three days, pilgrims endure harsh penitential observances that pose physical and mental challenges, bringing to the surface things often suppressed.
“I prefer the one-day retreat to the three-day pilgrimage,” a Lough Derg Pilgrim, Debbie, confessed. “You can concentrate on the prayers. In the three days, they say that the actions are the prayers.”
Those actions include staying awake during the first night and all the next day, observing a strict fast of dry toast and black tea or coffee, and walking barefoot around the “stations”—believed to be the remains of centuries-old monastic cells.
This triathlon of sorts—sleep deprivation, fasting and barefoot walking on jagged rock—has been called the Ironman of pilgrimages by The Irish Times, where pilgrims described pain and bloody soles.
One veteran pilgrim, Justin, told the Lough Derg team, “In those stormy moments, every station felt harder. The whole Lough Derg experience was far more difficult to endure than this one in the glorious sunshine,” proving how weather can turn the pilgrimage into a test of sheer grit.
Others pointed out the austerity of the fast with wry humor: “You don’t get milk for your tea,” one pilgrim reported. Honestly, no cream in my coffee might be harder for me than fasting from wine—both of which, of course, are missing from the Lough Derg menu.
But the all-night vigil is what truly stops pilgrims in their tracks. “The most difficult thing is staying up all night and then doing the Stations of the Cross afterwards. Some stay up for 24 hours, but others travel, so they’re up longer than 24 hours,” warned another pilgrim from County Mayo.
Hearing their firsthand accounts—of sleepless nights, barefoot rounds on cold stone, fasting, storm-swept penance and spiritual endurance—I finally grasped why this ancient rite is revered, feared and cherished by those who take it on.
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Why the Lough Derg Pilgrim Returns Year After Year
You may also enjoy: Books About the Camino de Santiago for Spiritual Travel
“I’ve done the three-day 13 times. I think that’s right—I’ve lost count,” admitted a pilgrim from County Mayo.
Thanksgiving, grieving, clarity and transformation are reasons Lough Derg Pilgrims return. “Others take on this spiritually challenging journey as a form of petitionary prayer, intentionally praying for God’s grace to transform their lives or the life of a loved one,” said Father Laurence in an interview with the National Catholic Register.
“It’s more a feeling than a word,” one male pilgrim explained. “It’s like a Stairway to Heaven.”
Maybe it’s also the feeling of being part of an unbroken chain of devotion stretching back to the early Middle Ages.
“The lighting of the candle symbolizes the continuing tradition of prayer since the 1100s that we are living today,” said the officiating priest during the Mass I attended.
Strong Family Traditions Around the Lough Derg Pilgrimage
Many pilgrims told me the three-day Lough Derg Pilgrimage has been part of their family tradition for generations. “You said by hook or by crook, we were going to be here,” explained the daughter of one pilgrim whose parents have come 30 times.
Families often return on the same day each year and reunite with friends they’ve met through the pilgrimage. Community is strengthened as much as personal spirituality.
Other Things to do in Donegal:
When you must drive on the side of the road that you’re not accustomed to, it’s nice to let others do the driving. Here are my recommendations for tours:
- 📌 Most popular: Donegal & Wild Atlantic Way Shore Excursion (always book your tickets ahead of time)
- 🏰 Most authentic: Donegal Private Coast and Castles Day Tour
- ⭐ Personal favorite: Sliabh Liag Cliff viewpoint – Shuttlebus Experience
- 🐟 Book an interactive food tour with Shines, an award-winning family seafood business in Killybegs, Donegal, selling only Irish tuna, Irish sardines and Irish mackerel. Get a photo in the world’s largest sardine can!
When you use one of these links to book your experience— any experience—I get a small commission at no cost to you. I appreciate your support of this website.
Pilgrims of Hope and the Modern Lough Derg Pilgrimage
Explore another American pilgrimage: The Wisconsin Way
Some pilgrims completed their first three-day Lough Derg Pilgrimage to finish their Jubilee 2025 Pilgrim Passport. Those who complete the three Irish pilgrimages receive a completion pin. “Have great memories of the time spent in prayer and fasting and of all the wonderful people I met there,” one pilgrim wrote on Facebook after completing the Pilgrims of Hope passport route to Croagh Patrick, Lough Derg and Knock.
I was honored to receive the completion pin as a journalist. I hope to complete the pilgrimages to Croagh Patrick and Knock Shrine in the future.
My Experience: A One-Day Lough Derg Pilgrimage Retreat
Unfortunately, I wasn’t in Donegal during the 3-Day Pilgrimage season, but I did take part in the One-Day Lough Derg Pilgrimage. Here’s how my day unfolded:
Ferry boats begin running at 9:15 am, and I hopped on one for the quick ten-minute crossing from the lakeshore. When I stepped onto the island, staff welcomed us with tea, coffee and freshly baked scones—a comforting start before the day’s spiritual work.
At 10:20 am, everyone gathered inside St. Patrick’s Basilica to begin the One-Day Retreat. The team handed us a printed program, and we followed a structured rhythm of prayer and reflection throughout the morning.
For lunch, the staff served soup, fancy sandwiches, tea and coffee. The break gave me a chance to chat with pilgrims who had returned many times, often for the full three-day Lough Derg Pilgrimage.
In the afternoon, the community came together once more in St. Patrick’s Basilica for the celebration of Mass, which closed the retreat with a deep sense of peace.
Starting at 4:00 pm, boats ferried pilgrims back to the lakeshore, ending the day as gently as it began.
I recommend that you dress in warm, waterproof layers to handle Donegal’s quick-changing weather. (Unlike the three-day pilgrims, those on the One-Day Retreat keep their footwear on—a small mercy!)
One Day Retreats at Lough Derg
One Day Retreats, running for more than 30 years, continue to facilitate a wide range of people who want to come on pilgrimage to Lough Derg. The One Day Retreat is open to adults and not suited to children. Fasting and walking barefoot is not required. Available on certain dates in May, August and September.
Four Places for Prayer and Peaceful Reflection
During my One Day Retreat on Lough Derg, I found myself drawn again and again to four sacred spaces.
I began in Saint Patrick’s Basilica, where the Tabernacle offered time with Jesus. I lingered before the Stations of the Cross, glowing through the windows of the Irish artist Harry Clarke, their light pulling me deeper into reflection.
At Saint Mary’s Chapel, I slipped into a pew and let the Word of God wash over me as I read and contemplated Scripture. A small alcove with candles became a space to leave my desires, petitions and intentions—something pilgrims have done here for centuries.
Across the island, Davog House offered a gentler, more contemplative rhythm. I browsed reading material set out for pilgrims, and soft meditative music filled the Quiet Room—an oasis for those who needed a moment to exhale.
Before leaving, I followed the winding stone path of the Labyrinth, a symbolic journey of life’s twists and inner turns. Step by step, it drew me into deeper silence, helping me listen—not to the noise in my head, but to the still, ancient whisper that seems to live on this little island.
Love the above image of St. Patrick’s Purgatory? Photographer Gareth Wray gave me permission to use it, and you can purchase your own copy here.
How to Visit Lough Derg from Dublin
Lough Derg is located in County Donegal, about 125 miles / 200 km northwest of Dublin. You have three primary options for visiting the island sanctuary of St. Patrick’s Purgatory:
1. Public Transport
You can reach Lough Derg by taking a Bus Éireann service from Dublin to Pettigo, the nearest village to the pilgrimage site. From Pettigo, taxis operate regular transfers to the Lough Derg lakeshore during pilgrimage season. This is the slowest option but ideal for pilgrims without a car or those wishing to travel prayerfully and simply.
2. By Rental Car
Renting a car in Dublin gives you the most flexibility. The drive takes roughly 3 hours via the M1 and N2, passing rolling countryside, monastic sites and classic Irish villages along the way. Ample parking is available at the Lough Derg visitor area before boarding the ferry to Station Island.
3. On Foot
Some modern pilgrims choose to walk to Lough Derg as part of a longer spiritual journey. See the map and guidebook below for suggested routes, historical pathways and safety notes. Walking adds a deeper contemplative dimension, echoing medieval pilgrims who approached the island on foot long before ferries and roadways existed.
“The Pilgrim’s Way to St. Patrick’s Purgatory” by Eileen Gardiner invites modern travelers to trace an ancient path from Dublin to mystical Lough Derg in County Donegal.
Along the way, this well-researched guidebook reveals Ireland’s medieval soul through abbey ruins, holy wells and the quiet echoes of countless pilgrims who’ve walked before us. Whether you journey by car, bike, foot or even boat, you’ll pass through some of the most breathtaking landscapes in all of Ireland.
Gardiner’s 2010 volume (Italica Press) includes detailed route descriptions, a helpful bibliography and an index to guide spiritual seekers and cultural explorers alike.
👉 Order “The Pilgrim’s Way to St. Patrick’s Purgatory” by Eileen Gardiner on Amazon.
A Holy Place
The Saturday night before I left for the Lough Derg Pilgrimage, I stayed at Fiddlestone Pub and B&B. I squeezed between two oldsters who seemed like they’d been occupying the same stools for generations.
One asked, with an occasional slurred word, where I was from and what I was doing in Ireland. When I mentioned I was heading to Lough Derg the next morning, he straightened his shoulders, looked me in the eye and said, “It’s a holy place.”
Now, after visiting Lough Derg myself, I couldn’t have said it any better. The island holds a holiness that settles into your soul, the kind that lingers long after the ferry carries you back to the world.
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Call to Action: Begin Your Own Pilgrimage Journey
If this story stirred something in your spirit, I invite you to explore more of the world’s most meaningful pilgrimage routes. Start with my guides to the Camino de Santiago and The Wisconsin Way—two transformational journeys that continue to shape modern pilgrims. Whether your first step is researching, dreaming or packing, may your path lead you somewhere holy.
More Pilgrimages & Travel Resources
-
Discover my in-depth Donegal food guide: Best Places to Eat in Donegal
-
Explore more spiritual journeys: Books About the Camino de Santiago
-
Learn about an American pilgrimage route: The Wisconsin Way
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Hi, I’m Stacey
UNSTOPPABLE Stacey Travel is a travel blog focused on immersive travel that highlights food, wine and the spirituality of place. You can count on me for accurate reports and insightful analysis as your trusted travel writer since 2008.
As the author of several spiritual and walking guides, I occasionally write about life as a Camino de Santiago pilgrim. See my Amazon author page here. You may review my credentials as a professional travel writer on LinkedIn.
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5 thoughts on “Why Ireland’s Lough Derg Pilgrimage Is the Toughest in the World”
Great post Stacey!
Thanks for your kind words, Rick Glad you liked the story about the Lough Derg pilgrimage
Thanks so much for your comment, Rick!
OMG, Stacey! I did “St. Patrick’s Purgatory” in June 2024–the most unforgettable experience! As I’m American, the proprietors at first didn’t think I’d survive since “the last American complained that the kneelers aren’t padded!” Upon hearing of that, I was determined to make the US proud, and I did! I did all that was required, made friends, and hopefully racked up some indulgences! It was difficult, with my delicate feet not prepared for the endless walking on sixth-century cobblestones (toughen ’em up in advance), the mercurial weather (layers!), and the midge onslaught on the last day (off the boat, go to the gift shop and buy all the midge repellent available–no joke, it was horrid!). When finally I was allowed to sleep, the bed in the tiny room, er, cell–no, stall–was the comfiest ever! Knowing there’d be no bus from Lough Derg to Enniskillen (the connection to Dublin) on a Wednesday, a wonderful woman from Northern Ireland took me to her house for tea before dropping me off at the Enniskillen stop. All this being said, I know why people return again and again!
Thanks so much for your report, Stephany! You made us proud! Isn’t it crazy how we all long to return?