Lough Gur

A horseshoe-shaped lake, Lough Gur wraps around the limestone hill of Knockadoon in County Limerick, in a peaceful and scenic setting.

It is one of Ireland’s most significant archaeological landscapes, with over 6,000 years of continuous human habitation, yet it remains blissfully quiet and free from mass tourism.

The History & Archaeology of Lough Gur

Every major era of Irish history, from Stone Age farmers and Bronze Age craftsmen to early Christian monks and Norman lords, left physical remains at Lough Gur.

Most of this was unknown, until in 1847 the local landlord started a drainage scheme to drop the lake level. His goal was agricultural, to free up hundreds of acres of fertile shore for cattle grazing and farming. What emerged made it clear that the area had been continuously farmed, built on and defended for over 6,000 years.

Early Excavation

Seán Ó Ríordáin

Between 1936 and the 1950s, Professor Seán P. Ó Ríordáin of University College Cork led a series of excavations on the slopes of Knockadoon, revealing an extensive network of Stone Age and Bronze Age farmsteads.

Both rectangular timber houses (identified by post trenches) and circular stone dwellings were found, some with clay hearths, internal storage pits or roofs supported by heavy oak posts. Soil samples showed that their inhabitants were clearing forest to grow crops and keeping cattle, sheep and pigs.

An enormous amount of pottery was found – so much that it redefined how early Irish ceramics were classified. The term “Lough Gur Class 1” was coined to describe finely made Neolithic bowls, while “Lough Gur Class 2” referred to coarser, heavier domestic pots.

When Ó Ríordáin died in 1957, he left a mountain of unpublished notes, site plans and artifacts. In the 1980s, archaeologists Eoin Grogan and George Eogan set about the monumental task of cataloguing and publishing his excavation records. Their work finally provided a complete picture of Knockadoon’s prehistoric settlement layout.

The John Hunt Connection

Working alongside Ó Ríordáin during these digs was a young John Hunt, the antiquarian, collector and medieval scholar. His experience at Lough Gur shaped his understanding of early Irish architecture and material culture.

Decades later, when Hunt spearheaded the interior restoration of Bunratty Castle and helped to establish the Bunratty Folk Park, his time at the lake directly inspired his reconstructions of Irish dwellings.

Rose Cleary’s Excavations

Beginning in the late 1970s and continuing for four decades, archaeologist Rose Cleary led highly targeted excavations around the lake. Her digs helped refine the radiocarbon dating for the stone circles and house foundations, filling in missing gaps between the Late Stone Age and the Bronze Age.

She uncovered 13th and 14th century houses and medieval farm enclosures and found over 1,000 visible monuments across the Lough Gur landscape.

In 2018 she published The Archaeology of Lough Gur, a comprehensive study bringing together Ó Ríordáin’s work and her own into a single authoritative record.

Though now retired she continues to act in a voluntary advisory capacity at Lough Gur, where work has moved to use of non-invasive technologies. Previously unknown enclosures, foundations and field boundaries continue to be discovered.

Folklore & Legend

Despite being a shallow lake, there is a rich store of legend about what lies beneath Lough Gur.

Tradition holds that a prosperous city once stood in the valley where the lake now lies. The story goes that its inhabitants offended a local holy man who caused a subterranean spring to burst forth and drown the settlement overnight. On clear, still, evenings fishermen have claimed to see the outline of roofs beneath the water and hear church bells ringing.

Locals have also spoken of a phantom tree visible just below the surface of the water, wrapped in shimmering green cloth. Beneath the tree a magical weaver sits working a loom. According to the legend, once every seven years the tree rises above the waterline for a few moments before vanishing back into the depths.

Stories also tie the lake to Gearóid Iarla, the 3rd Earl of Desmond, who disappeared without a trace in 1398. He is said to sleep beneath the waters of Lough Gur, emerging once every seven years on a silver shod horse.

What to see at Lough Gur

Grange Stone Circle

Wedge Tomb

Carraig Aille Ringfort

Grange Stone Circle

Grange Stone Circle sits just north of the lake and is the largest, most complete stone circle in Ireland with its 113 standing stones forming an almost exact ring  over 45m wide. A post hole discovered at its centre suggests it was carefully measured with a rope or string tied to a central stake.

Constructed during the Late Neolithic or Early Bronze Age (c. 2500–2000 BC), its entrance stones align precisely with the rising sun on the Summer Solstice. Thousands of pieces of beaker pots, animal bones and other objects have been found within the circle, suggesting that it had a role in sacred ritual.

Lough Gur Wedge Tomb

This wedge-shaped gallery grave dates to a similar period as the stone circle and is sometimes known as The Hag’s Bed (Leaba na Caillighe), for its association with the ancient crone goddess Cailleach. Its stone walls and massive roof capstones remain remarkably intact.

Carraig Aille Ringforts

High on a limestone ridge overlooking the lake, Carraig Aille I and II are circular stone forts or cashels. They served as the fortified homesteads of local Gaelic chieftains during the Early Christian era, positioned to give them a commanding view over the surrounding countryside to spot approaching raiders.

The Spectacles

Bourchier's Castle

Teampall Nua

The Spectacles

An early medieval site that gets its name from its layout: two circular stone-walled hut foundations linked by a central stone wall. While remains of castles or fortifications from the period are relatively common, this is a rare, visible footprint of an everyday family farmstead from around the 8th to 10th century.

Bourchier’s Castle

Standing at the north-east approach to Knockadoon is a classic example of a Munster tower house, built in the 15th-century to control access to the peninsula. Named after Sir George Bourchier, an Elizabethan settler who acquired the land around Lough Gur after the Desmond Rebellions. It sits now in the disused farmyard attached to Loughgur Castle house, of which more anon.

Teampall Nua

Despite its name, which means New Church, this is actually the older of the two churches by the lake. Built around 1420 by Margaret FitzGerald, Countess of Desmond, it replaced earlier wooden or simple stone chapels. During the 18th and 19th centuries it served as the burial place for prominent local families – look for names like De Salis, Ledger and Baylee. More recently, a simple gravestone marks the final resting place of John and Gertrude Hunt, who chose to be buried here.

The Visitor Centre

I’m not always a huge fan of visitor centres but this one is exceptional. Housed in a thatched building designed to resemble a traditional Neolithic house, it is small and community-run and provides very helpful context to the site without dominating the shoreline.

Inside are replicas of major local finds like the Lough Gur Shield (also on the post above), historical displays and maps of the surrounding monuments.

Visitor Details & Map for Lough Gur