Aerial view of Lough Carra showing a large lake, green fields, brown marshland, and distant mountains.
Aerial view of Lough Carra showing green fields, water, and distant mountains under a cloudy sky. Courtesy Joyce Country and Western Lakes Geopark

Lough Carra

📍 Mayo

🏛️ Attraction

Last updated: 21 May 2026

Overview

Lough Carra (Irish: Loch Cairbre) sits roughly 16 km south of Castlebar in County Mayo. Covering approximately 1,560 hectares (4,000 acres), it is Ireland’s largest marl lake and the finest example of a shallow, calcium-rich lake in Western Europe. The water body stretches about 6 miles (9.7 km) in length, reaches up to a mile across at its widest point, and averages just 6 feet (1.8 m) in depth, though it dips to 60 feet (18 m) in a few deeper basins. Its irregular shoreline is punctuated by more than 70 islands, sheltered bays and rocky promontories, all set against a landscape of limestone pavement, fen and native woodland. Designated as a Special Area of Conservation (SAC), Special Protection Area (SPA) and Natural Heritage Area (NHA), the lough forms a vital part of the Great Western Lakes system, draining into Lough Mask via the Keel River.

History & Landmarks

The eastern shore is dominated by the romantic ruins of Moore Hall, the 18th-century seat of the Moore family. The house was damaged by fire during the Irish Civil War in 1923, but its remaining stone walls and vaulted service tunnel have since become a protected roost for the endangered Lesser Horseshoe Bat. The Moore family were significant figures in Irish literary and political circles; celebrated novelist George Moore (1852–1933) is buried on Castle Island, where his ashes face the water.

A quieter local curiosity stands on Church Island: a distinctive stone spire commissioned in the late 1700s by Bishop Harvey of Derry. He had it built so he could spot it from his home at Ballyscullion, a small but enduring reminder of the lake’s long-standing draw for those living along its shores.

Further along the western edge, the remains of Burriscarra Abbey and a nearby early medieval ringfort speak to centuries of settlement. The ringfort survives as a low earthwork just north of the abbey ruins, while the lake’s name, Loch Cairbre, is traditionally linked to the legendary Connacht king Cairbre Nia Fer.

Wildlife & Nature

The lake’s unique marl composition creates a nutrient-rich environment that supports an unusually diverse ecosystem:

  • Fish – Lough Carra is internationally recognised for its brown trout fishery. Healthy populations of pike and perch also thrive in the shallows.
  • Birds – Over 140 species have been recorded. Winter brings a starling roost that can swell to 60,000 birds, while August sees up to 30,000 swallows gathering at Castle Burke. Photographers frequently visit at dusk to capture murmuration displays over the northern bays.
  • Flora – The limestone shores host more than 400 higher-plant species, including 20 of Ireland’s 26 native orchids. Look for Bird’s-Nest, Bee, Pyramidal, Fly and the highly scented fragrant orchid, particularly between late May and July.
  • Mammals – Eight bat species use the surrounding woodlands, alongside red squirrels, pine martens, stoats and otters. The ruined service tunnel beneath Moore Hall provides a stable microclimate for the Lesser Horseshoe Bat colony.

Walking & Exploration

The lakeshore offers several self-guided routes suitable for all fitness levels:

  • Moore Hall Loop – A flat, stroller-friendly circuit starting from the main car park. It circles the house ruins, passes the bat roost tunnel and returns with open views across the water.
  • Stile-to-Woodland Walk – Cross the small bridge on the access road, turn left over the stile and follow a narrow path through broadleaf woodland that descends to the reed beds.
  • Castle Burke Trail – A 90-minute walk from the northern car park offering prime vantage points for waterfowl, greylag geese and black-headed gulls.
  • Kiltoom Tomb – Located directly across from the car park, this historic burial site is surrounded by eight Irish Yew trees (Taxus baccata frastigiana) that periodically regenerate from their trunks.
  • Ringfort & Abbey Detour – A short walk from the Burriscarra Abbey car park reveals the subtle earthwork remains of the medieval settlement.

Fishing & Water Activities

Lough Carra operates as a late-season fishery. Angling activity typically begins in the first week of May when the Mayfly hatch triggers peak trout feeding. Wet-fly, dry-fly and dapping techniques are most effective from May through June, after which pike and perch remain active through the summer months.

  • Brown trout – No angling licence is required for brown trout on Lough Carra, though a day-boat permit is mandatory if fishing from a vessel.
  • Pike & perch – No licence needed; anglers are asked to follow the Inland Fisheries Ireland code of conduct.
  • Sea-trout – Rare in the lake, and subject to a regional catch-and-release ban.

For non-anglers, the calm, aquamarine waters are ideal for kayaking and canoeing. Small-boat hire and guided trips are available through several Bord Fáilte-approved guesthouses and local tackle shops, offering close-up views of the islands and reed-filled coves.

Conservation & Community

Lough Carra is the flagship site for a €5 million EU LIFE programme (2021–2026) managed by Mayo County Council and the Lough Carra Catchment Association (LCCA). Funding is directed at reducing agricultural nutrient runoff, restoring orchid-rich grasslands and cladium fens, and protecting habitats for otters, bats and ground-nesting birds. The project also includes active management of invasive American mink and non-native aquatic plants.

The LCCA’s “Our Lake, Our Heritage” initiative (launched 2025) runs citizen-science events, guided habitat walks and a bioblitz each August during Heritage Week. Volunteers can assist with water quality surveys, invasive species monitoring and biosecurity outreach.

Practical Information

  • Access & Parking – The main free car park sits beside the Moore Hall ruins, accessible via the R310 from Castlebar. Space is ample and suitable for families.
  • Hours & Entry – Open daily, 24 hours. No admission charge.
  • Facilities – Picnic tables and a seasonal toilet block are located at the car park. A marked, wheelchair-accessible path runs along the Moore Hall Loop.
  • Dogs – Permitted on leads along public paths; please keep them off private farmland sections.
  • Transport – Public bus service is limited; the nearest stop is in Ballinrobe (≈10 km). A car is recommended for full access to the northern and western trails.
  • Biosecurity – Signage at entry points reminds visitors to “Check, Clean, Dry” boots, bikes and fishing gear to prevent the spread of invasive species and mudskipper mites.

Nearby Attractions

A short drive connects Lough Carra to Aasleagh Falls, the historic market town of Ballinrobe, and the pilgrimage heritage of Ballintubber. The Atlantic coastline and Connemara National Park lie within 45 km, while Westport (≈30 km) offers a wider selection of accommodation, restaurants and cultural venues.

For the best experience, plan your visit in late May to catch the Mayfly hatch alongside the peak orchid blooms, and book boat permits with local tackle shops at least a week ahead during the summer season.