Donegal Highlands

Discover Ireland's most dramatic mountain landscapes on this route through the Donegal Highlands. Glenveagh National Park, the Derryveagh Mountains, and the Poisoned Glen create scenery as wild as anywhere in the Scottish Highlands.

Why This Route?

The Donegal Highlands are genuinely wild:

• National Park - Glenveagh is Ireland's second-largest national park
• Mountain drama - Errigal, Mount Muckish, and the Derryveagh range
• Historic estate - Glenveagh Castle and its remarkable gardens
• Rare wildlife - Golden eagles reintroduced here
• Empty roads - Some of Ireland's quietest driving

Where to Stay

This 138km route runs from Letterkenny through Glenveagh National Park, the Poisoned Glen, and Errigal before ending at Dunfanaghy on the north coast -- a linear journey through genuinely remote highlands. With two days recommended, you will want a base at each end of the route: Letterkenny for exploring the eastern approach and Glenveagh, and Dunfanaghy for Horn Head, Bloody Foreland, and the Atlantic coast section.

Letterkenny

Donegal's largest town has the widest choice of hotels, restaurants, and services. It sits at the gateway to the highlands, making it ideal for an early start into Glenveagh National Park. The visitor centre, castle, and gardens are less than 30 minutes away.

Dunfanaghy

This charming village at the route's western end gives direct access to Horn Head's sea cliffs, Ards Forest Park, and the Bloody Foreland sunset drive. After a day among the mountains, Dunfanaghy's restaurants and relaxed atmosphere make a rewarding finish.

The Mountains

The Derryveagh Mountains ("red oak mountains") include some of Ireland's most distinctive peaks:

• Errigal (751m) - The iconic quartzite cone, Ireland's 31st highest
• Muckish (666m) - The distinctive flat-topped "pig's back"
• Dooish (652m) - Remote and rarely climbed
• Slieve Snaght (683m) - Central Derryveagh peak

The Route

Starting from Letterkenny

Donegal's largest town has all facilities. Head northwest into the highlands.

Glenveagh National Park

The centrepiece of the route - allow at least half a day. The park includes:

Glenveagh Castle

A Victorian hunting lodge in spectacular lakeside setting. The castle and walled gardens are accessible by shuttle bus from the visitor centre (or a pleasant 3km walk).

The Gardens

Remarkably exotic for this northern latitude - rhododendrons, rare plants, and designed landscapes.

Walking Trails

Multiple options from easy lakeside strolls to challenging mountain hikes.

Wildlife

• Red deer - Ireland's largest herd
• Golden eagles - Reintroduced in 2000 (still rare)
• Red squirrels - Common in the forests
• Arctic char - Rare fish in Lough Veagh

The Poisoned Glen

Perhaps Ireland's most dramatic glacial valley - a U-shaped glen beneath Errigal's eastern face. Legend says poison spurge once grew here, or that the name is a corruption of "heavenly glen." A popular walking destination.

Errigal Mountain

The iconic quartzite peak dominates the landscape. The climb from the Dunlewy car park is challenging but non-technical:

• Distance: 5km return
• Time: 3-4 hours
• Difficulty: Challenging (steep scree)
• Highlights: 360-degree views, distinctive summit ridge

Dunlewy (Dún Lúiche)

A scattered community at Errigal's foot. The Ionad Cois Locha visitor centre has a restored cottage, boat trips on Dunlewy Lough, and weaving demonstrations.

Muckish Gap

Drive through this mountain pass for views of the distinctive flat-topped Muckish. The old sand workings on the mountain create an unusual landscape.

Gortahork & Falcarragh

Gaeltacht villages where Irish is the community language. Excellent traditional music in local pubs.

Atlantic Drive

Loop out to the coast at Bloody Foreland, named for the red glow of sunset on its rocks. Horn Head beyond is one of Ireland's finest sea cliff headlands.

Dunfanaghy

A charming village with excellent facilities, Horn Head access, and Ards Forest Park nearby.

Walking Highlights

Glenveagh Trails

• Derrylahan Trail - 3km, 1 hour, easy, woodland walk
• View Point Trail - 2km, 45 mins, moderate, castle views
• Long Range Walking - 14km, 5-6 hours, challenging, full glen exploration

Errigal Summit

• Distance: 5km return
• Time: 3-4 hours
• Difficulty: Challenging
• Note: Scree requires care; not suitable in poor visibility

Poisoned Glen

• Distance: 7km return
• Time: 3 hours
• Difficulty: Moderate
• Highlights: Dramatic cliffs, abandoned church

Practical Tips

1. Glenveagh shuttle books up - Arrive early in summer
2. Errigal is serious - Proper boots, waterproofs essential
3. Weather changes fast - Mountains create their own weather
4. Limited facilities - Bring food for remote sections
5. Gaeltacht areas - Signs in Irish; locals appreciate Irish greetings

Wildlife Watching

Golden Eagles

The reintroduction project began in 2000. Sightings are rare but possible, especially in remote areas of the park.

Best Spots

• Glenveagh visitor centre has wildlife information
• Early morning and evening best for deer
• Scan the skies in the Poisoned Glen for eagles

Before You Drive This Route

Plan on 2 days for the Donegal Highlands: the 138km takes roughly 3.5 hours at the wheel, and the rest is why you came. If this is your first drive in Ireland, read driving on the left in Ireland before you collect the car — the first roundabout is not the moment to work it out. For what a trip like this costs in 2026, from fuel to beds, see the budget guide. If you have not booked a car yet, our guide to renting a car in Ireland covers what to choose and what the desk will ask for, and car hire excess insurance explains the excess you will be asked to cover. More drives in the same corner of the country are on the County Donegal page, and the Inishowen 100 pairs naturally with this one.