Cooley Peninsula
A mountainous peninsula between Carlingford Lough and Dundalk Bay, and the setting of the oldest story in Irish literature.
Updated 28 August 2026
The Cooley peninsula fills the corner of Louth between Carlingford Lough and Dundalk Bay, rising to 589 metres at Slieve Foye with the Mourne Mountains directly across the water. It is the setting of the Tain Bo Cuailnge, the Cattle Raid of Cooley, the central text of the Ulster Cycle and the oldest sustained narrative in Irish - the story of Medb's army coming for the brown bull of Cooley and Cu Chulainn holding the ford alone. Place names across the peninsula still map onto the tale. Carlingford itself is a medieval town with King John's Castle, a mint and a tholsel surviving among its lanes. The Cooley Mountains carry waymarked walking routes including a section of the Tain Way, and there is a greenway along the old railway line. Slieve Foye's slopes are steep and the summit ground is rocky with unmarked sections.
What's there
- Slieve Foye - 589 metres above Carlingford, with the Mournes across the lough.
- The Tain landscape - place names from the Cattle Raid of Cooley.
- Carlingford town - King John's Castle, the mint and medieval lanes.
- The Tain Way - waymarked walking over the peninsula's high ground.
When to go
April to October. Carlingford is busy at weekends and during its summer festivals. The mountain routes need clear weather; cloud sits on Slieve Foye frequently.
Good to know
Carlingford is heavily geared to weekend visitors and can be crowded and loud. The mountain walking is rougher than the town suggests, with unmarked sections. Parking in Carlingford is difficult at peak times.
Nearby
Dundalk is west; the Mourne Mountains are across Carlingford Lough.
Key facts
Source: Wikidata, item Q1129702, read on 18 October 2026.
What to pack for Cooley Peninsula
Chosen from what this place is for. Tap a kit for the full checklist.
- Broken-in walking shoes or boots - Grip and ankle support matter more than looks; never hike in brand-new boots. Find on Amazon
- Layers + a waterproof shell - Mountain weather turns fast; a packable rain jacket saves the day. Find on Amazon
- Daypack with rain cover - 20-30 litres holds water, snacks, layers and a first-aid kit. Find on Amazon
- Offline maps + a power bank - Download the trail before you lose signal; carry backup charge. Find on Amazon
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