Castleisland, Oileán Ciarraí, Co. Kerry

Oileán Ciarraí · Co. Kerry

A market town stretched along one street, with a million-year-old cave out the road.

Castleisland sits on the N21 between Tralee and Limerick, doing the unglamorous work of being a market town. The main street is famously long - long enough that people round here call it the longest village in Ireland and only half mean it as a joke. The journalist Con Houlihan, who grew up here, summed it up better than anyone: not so much a town as a street between two fields. The traffic crawls. The shops keep their hours. Tuesday is for the mart and Friday is for everyone coming in to do the messages.

The 1226 castle that gave the town its name - Geoffrey de Marisco's fortification on the island in the river - was knocked about for four centuries and finished off in 1641. There's a stump of it still at the western end on the Killarney road, more outline than building. The bypass opened in 2010 and took the worst of the lorries off the street, which the town is quietly grateful for.

The reason a stranger stops is Crag Cave. Limestone, around a million years old, found in the modern sense in 1983 when a Welsh cave diver pushed through a flooded passage that had stopped everyone before him. The Geaney family, who farmed the field above it, opened 350 metres of it to the public and have been running tours ever since. The walk underground is short, sharp, and worth the diversion off the road to Tralee.

Don't come for a weekend. Come for an hour, or come on a Tuesday and stay for a coffee while the mart is on. Castleisland is the kind of town the country runs on, and it's more itself when it isn't trying to entertain you.

Population

2,536

Walk score

One long main street, end to end in fifteen minutes

Founded

1226

Coords

52.2307° N, 9.4647° W

01 / 09

At a glance.

Three things every local will eventually mention. Read these and you've already understood more than most day-trippers do.

01 The street

The longest village in Ireland, locally.

The main street runs so far the joke writes itself. Con Houlihan called it "not so much a town as a street between two fields". The traffic crawls. The shops keep their hours. Walk it end to end in a quarter hour.

Stories & lore → 02 Crag Cave

A million years under the limestone.

Two kilometres out the Tralee road. A diver named Martyn Farr pushed through a flooded sump in 1983 and found 3.8 kilometres of cave on the other side. The show section runs 350 metres, properly lit, an hour underground.

Walks & outings → 03 The mart

Tuesday is a working day.

The cattle mart still runs on Tuesdays and the town shifts shape around it. Farmers from three counties, sticks and caps, deals done by a nod. If you want to see the place as it actually is, come on a Tuesday morning.

Stories & lore →

02 / 09

The pubs.

None of these are themed Irish pubs, because they don't need to be. A few that earn the trip:

Browne's Bar

Locals, steady

Traditional pub

On the main street. The kind of pub where the regulars have their stools and the talk is mostly the GAA, the weather, and who sold what at the mart on Tuesday.

McCarthy's of Castleisland

Mixed, food served

Hotel bar

The bar at McCarthy's Hotel does food all day and pulls a steady mix of farmers in from the mart, locals after work, and the odd traveller off the N21. Music some weekends.

The River Inn

Working pub, food till late

Pub & food

Out on the edge of town. Carvery at lunchtime, pints in the evening. Useful if you arrive after the main-street places have stopped serving.

The Square Bar

Late, sociable

Town-centre pub

On the square at the end of the main street. Stays open later than most. Nothing fancy, which is the point.

03 / 09

Where to eat.

Place	Type	€	Local note
The Brogue Inn	Pub food & carvery	€€	Carvery at lunch, full menu in the evening. Big portions, fair prices, the kind of plate the mart crowd put away on a Tuesday and the hauliers depend on the rest of the week.
The Cellar Restaurant	Restaurant	€€	Down the steps off the main street. The Castleisland sit-down dinner option for years. Steaks, fish, the occasional flourish. Book on a Friday.
Russell's Restaurant	Family restaurant	€€	Long-running family place. Roasts, mixed grills, a proper carvery. Not chasing trends. Doesn't need to.

04 / 09

Where to sleep.

Place	Type	Local note
River Island Hotel	Hotel	The town hotel, on the main street. Decent rooms, leisure centre, a bar and restaurant downstairs. Used by wedding parties and N21 travellers in roughly equal numbers.
McCarthy's Hotel	Hotel	Smaller, family-run, on the main street. The bar is a destination in its own right. Good value, central, no fuss.
B&Bs around Crag Cave	B&B	A handful of farmhouse B&Bs out the Tralee road near the cave. Quieter than the town, useful if you're doing the cave first thing in the morning.

05 / 09

Stories & lore.

The reason to come back. The things every local will eventually tell you about, usually after the second pint.

A diver, a sump, a million years

Crag Cave

The entrance had been known since the 1850s - the Geological Survey of Ireland mentioned "caves worn by water" - but no one could get past the flooded passage they called the Green Lake. In 1983, a Welsh cave diver named Martyn Farr put on his kit, swam the sump, and surfaced in a chamber no one had ever seen. By 1985 the surveyors had mapped 3.8 kilometres of it. The Geaney family, on whose land the cave sat, opened 350 metres as a show cave in 1989. It's still in the family.

Con Houlihan's line

The longest village in Ireland

The Castleisland main street is famously long. Long enough that the locals call it the longest village in Ireland, and the joke has been around for so long it's nearly a fact. Con Houlihan, the great Kerry sports journalist who grew up in the town, put it best: "not so much a town as a street between two fields". The shape comes from the way the town grew along the road rather than around a square. There is a square - at one end - but the street is the thing.

The fortification that gave the town its name

The 1641 castle

Geoffrey de Marisco - Lord Justice of Ireland under Henry III - built a castle on the island in the river in 1226. It stood for four centuries, changed hands during the Desmond rebellions, and was finally destroyed in 1641 during the wars that followed. What's left is a stump of tower at the western end of the town, on the Killarney road. You can stand beside it and read the sign and that's about all there is to do, but it's the reason the town is called what it's called.

How the town keeps time

The Tuesday mart

The cattle mart in Castleisland has been running for generations and still sets the rhythm of the town's week. Tuesday morning the lorries come in, the pubs do early lunches, the bookmakers and the agricultural-supply shops do their best business of the week, and the talk in every queue is bullocks and beef prices. It's not put on for visitors. If you want to understand a Kerry market town, come on a Tuesday before noon.

06 / 09

Things to do outside.

Wear waterproofs. Bring a sandwich. Tell someone where you're going if it's the mountain.

Crag Cave (underground) Two kilometres out the Tralee road. Guided tour through the lit section of the cave system - stalactites, a chamber called the Crystal Gallery, and water that's older than most things you'll see this week. Open year-round. Café and a playground above-ground if you have small people with you.

350 m show cavedistance

45 min tourtime

Castleisland Town Park Off the main street. Small but properly kept - tarmac path, a stream, a few benches. Useful if the children need running around or you need a stretch off the N21.

1 km loopdistance

20 mintime

The main street, end to end Worth doing once just to settle the question. Start at the square, walk west, and you end up at the castle stump on the Killarney road. The longest village in Ireland, allegedly.

1.5 kmdistance

15 mintime

07 / 09

When to go.

There is no bad time. There are different times.

Spring

Mar-May

Quiet on the road, the cave temperature unchanged (it's always cool down there), the country around the town greening up. Lambing on the farms outside.

◉ Go

Summer

Jun-Aug

The cave is busy with families on day trips out of Tralee and Killarney. Book the tour in advance in July and August. The town itself never gets crowded - the visitors come for the cave and leave.

◉ Go

Autumn

Sep-Oct

Mart in full swing as the calves come down off the hills. Quiet in the cave, busy on the street. The right month for it.

◉ Go

Winter

Nov-Feb

Short days, plenty of rain, the cave still open but the town goes quiet by half five. Fine for a stop on the way somewhere; not really a destination on its own.

◐ Mind yourself

08 / 09

What to skip.

Honestly? Don't bother.

If a local was sitting beside you, this is the bit where they'd lean in.

Trying to make Castleisland a base

It isn't one. Stay in Tralee or Killarney and come over for the cave or the mart. The town is built for working, not for weekending.

Looking for the actual castle

There's a stump of tower on the Killarney road and a sign explaining what isn't there. The castle was destroyed in 1641. Manage your expectations.

Driving through and not stopping at Crag Cave

The cave is the reason a stranger has any business in Castleisland. If you've come this far, take the forty-five minutes underground.

The N21 on a Tuesday around 11am

Mart traffic. Lorries, trailers, slow farm jeeps, no overtaking. If you're in a hurry, go earlier or go later.

Getting there.

By car

On the N21 between Limerick and Tralee. Tralee is 16km west (20 min). Killarney is 19km south on the N23 (25 min). Limerick is about an hour east. The 2010 bypass means you can skip the town if you want - but that defeats the point.

By bus

Bus Éireann 13 (Dublin-Tralee) and 14 (Limerick-Tralee) both stop on the main street. Several services daily.

By train

No station. The line closed to passengers in 1947 and fully in 1977. Nearest station is Tralee, then bus or taxi (20 minutes).

By air

Kerry Airport (KIR) is 20 minutes south on the N23. Cork is 1h 30m. Shannon is 1h 15m.