Overview
Fahy Lough is a shallow lake in the blanket-bog country of Erris, in north-west County Mayo, about 4½ km west of Ballycroy and roughly 5 km south-east of Doohoma. It’s not on any itinerary, and there’s very little here in the built sense – no car park, no café, no information board, no waymarked path. What there is: open water, a wide bog-and-mountain horizon, and the near-certainty that you’ll have it to yourself.
Be honest with yourself about why you’d come. This is a place to stop, look and move on, not a half-day attraction. Set your expectations to ‘quiet corner of Erris’ rather than ‘lakeside walk’. (Note, too, that there’s a second, better-known Fahy Lough on Omey Island in Connemara – a different lake in a different county, and easy to confuse when searching.)
The setting
The ‘Fahy’ in the name comes from the Irish faithche, an old word for a green or a field, though the exact form for this lake isn’t recorded. The land around it is peat and rough grazing rather than tidy meadow – classic west-Mayo bog, where the water level rises and falls with the rain and the shoreline turns soft and boggy underfoot after a wet spell.
There’s no built trail. If you walk, you’re picking your own line over uneven, often waterlogged ground, so wear proper boots and don’t count on getting all the way round dry-shod. Weather off the Atlantic changes fast out here; bring waterproofs whatever the forecast says.
Doona Castle and the shipwreck stories
The most interesting thing near the lake is Doona, the townland just to the west, and its ruined tower house – Fahy Castle, also called Doona Castle – set over a strategic stretch of water and tangled up in local stories of Spanish shipwrecks along this coast. Abbey ruins stand nearby as well. Ballycroy village itself, a few kilometres east, was the setting for the 1982 television film The Ballroom of Romance.
Getting there and nearby
You need a car; no public transport serves the immediate area. The lake is reached on minor roads off the N59 near Ballycroy – signage is minimal, so load an offline map before you go, as phone signal is patchy. Dogs should be kept on a lead in spring and early summer when ground-nesting birds are about.
The obvious pairing is Wild Nephin (Ballycroy) National Park, just east, with its bog boardwalk and one of Ireland’s designated dark-sky reserves; the Mullet Peninsula and its beaches lie to the north-west. Fahy Lough works best as a five-minute pause on a bigger loop of Erris, not a destination in its own right.