An Loch Mór (Irish for ‘the big lake’) is the only freshwater lake on Inis Oírr, which on an island built almost entirely from bare limestone and salt water is more of a curiosity than it sounds. It sits in a shallow hollow of karst on the road out to the Plassey shipwreck, holding rainwater where the porous rock everywhere else lets it drain straight through. That single fact – water that stays put – is why there’s heather, reeds and birdsong here at all.
Be clear-eyed about scale, though. This is a small, shallow lake, not a headline sight. Come for the half-hour walk, the birds and the quiet; don’t make a special crossing for the lake alone. The sensible move is to fold it into the walk out to the Plassey wreck, which it shares a road with.
Getting there
The lake is a 20-minute walk or a 10-minute cycle from the ferry pier in the village of Inis Oírr, straight along the eastern road. Several shops by the pier hire out bicycles – reckon on roughly €10–15 for a few hours – and the pony-and-trap drivers and minibus tours both pass this way. There’s no formal signage to rely on, but the band of green around the water is easy to pick out against the grey rock.
Ferries reach the island from Doolin (15-minute crossing, seasonal April–October; a return runs around €32 for an adult) and from Rossaveal (55 minutes, year-round). Book ahead in high summer – the Doolin boats sell out.
The lake and its wildlife
The greener fringe tells an older story than the surrounding pavement. The Aran Islands were wooded before Neolithic farmers cleared them for grazing, and the heather, ferns, mosses and seasonal wildflowers along the banks are what hangs on in the damp ground the lake keeps wet. For generations it was also the island’s freshwater source for livestock.
For somewhere this size, there’s a fair amount of life. Swallows work the water in spring, waders pick the margins in summer, and waterfowl winter here. Hares and badgers turn up in the surrounding scrub, and otters are seen along the shore now and again – a good sign for a small freshwater habitat. The lack of foot traffic is exactly what makes it worth the binoculars: move quietly and keep your distance.
There’s no marked path, but the perimeter walks easily and a loop takes about half an hour, with open views across the water to the mainland. Still mornings and evenings are best for photographs, when the surface mirrors the sky. Seasonal angling happens here too, though check what’s allowed locally before you cast.
Practical notes
Nothing on site – no toilets, no café, no shelter. Bring what you need and pack it out again. The ground around the shore is uneven limestone that turns slick after rain, so wear sturdy, waterproof shoes, and the whole lake is open to the Atlantic wind, so a windproof layer earns its place even in July. Dogs are fine on the open paths but keep them close to spare the nesting birds and livestock.
Nearby
The MV Plassey shipwreck is the obvious pairing, a short walk on along the same road. O’Brien’s Castle and the Blue Flag strand at An Trá sit about a kilometre from the pier, and the island’s medieval churches fill out an easy day on foot. Our Aran Islands feature covers the wider trip.