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Hiking trails & Routes
United Kingdom
Northern Ireland
Down
Ballaghbeg

Slieve Commedagh and Glen River Loop

Moderate

4.8

(27)

175

hikers

Slieve Commedagh and Glen River Loop

04:19

10.5km

740m

Hiking

Embark on the Slieve Commedagh and Glen River Loop, a moderate hike spanning 6.5 miles (10.5 km) with a substantial 2425 feet (739 metres) of elevation gain. This route typically takes around 4 hours and 19 minutes to complete. You'll begin by following the picturesque Glen River through deciduous woodland before the ascent truly begins. As you climb, the terrain becomes varied and challenging, leading you towards panoramic views. From Slieve Commedagh Summit, you can look out over the Irish Sea, the coastline of Newcastle, and the vast dunes of Murlough Nature Reserve.

The starting point for this hike is the Donard car park. Be aware that this car park can get very busy, especially on weekends, so plan to arrive early. While the initial section along the Glen River may have many other hikers, the rest of the loop often provides a feeling of quiet solitude. Prepare for steep sections and varied underfoot conditions, including uneven ground, particularly on descents from Commedagh where paths might be less defined.

This loop offers a diverse journey through the Mourne Mountains. You will experience both the gentle flow of the Glen River and the rugged ascent to Slieve Commedagh. The trail provides outstanding vistas of the surrounding peaks and the coastline, making it a rewarding experience for those seeking a challenging day out in nature. It's a great way to explore the varied landscapes of this iconic Irish mountain range.

Last updated: April 23, 2026

Waypoints

A

Start point

Parking

Get Directions

1

341 m

Donard Park Waterfall

Highlight • Waterfall

Donard Park is a beautiful public space located at the foothills of the Mourne Mountains in Newcastle, Northern Ireland. The park boasts some wonderful views of the mountains, including up to Slieve Donard, which is the highest of them all. You can also discover woodland trails, a babbling brook and mini waterfalls.

Tip by

2

2.50 km

Amazing views of Newcastle.

Tip by

3

2.80 km

The Ice House, Slieve Donard

Highlight • Historical Site

The Ice House, on the slopes of Slieve Donard, was restored to its former glory in the mid 90s for the National Trust. It would have been originally used as a convenient place to store naturally refridgerated ice. Today, it's an intruiging sight by the tumbling Glen River.

Tip by

4

3.75 km

Entrance to The Mournes

Highlight • Viewpoint

Here you will enter 'The Mournes', a majestic granite mountain range situated in County Down, in the south-east of Northern Ireland. The Mournes are characterised by rugged peaks, sparkling reservoirs, epic scenery, and legendary stories.

Tip by

5

6.27 km

Slieve Commedagh Summit

Highlight • Summit

Slieve Commedagh, at 767 meters, is the second-highest peak in the Mourne Mountains and a rewarding climb for any hiker. Its summit offers sweeping views across the Mournes and out to the Irish Sea, a reminder of how close these mountains sit to the coast. The ascent is steep and demanding, often over pathless ground, but never overly technical in good weather. You can climb it on its own or link it with nearby peaks such as Slieve Donard, making for a truly memorable day in the heart of the Mournes.

Tip by

B

10.5 km

End point

Parking

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Way Types & Surfaces

Way Types

4.15 km

3.69 km

924 m

806 m

723 m

197 m

Surfaces

4.48 km

3.28 km

1.80 km

605 m

328 m

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Elevation

Elevation

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Weather

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Tuesday 7 July

23°C

12°C

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Frequently Asked Questions

Is the Slieve Commedagh and Glen River Loop suitable for beginners?

No, this loop is generally classified as hard or challenging. It requires a good level of physical fitness and some prior hill-walking experience due to significant ascent (around 739 meters) and varied terrain, including steep climbs and uneven sections. Navigation skills are also crucial, especially if visibility is poor.

What is the terrain like on this trail?

The terrain varies significantly. It starts on a gravel path, transitioning into a deciduous woodland alongside the Glen River with exposed tree roots, rocks, and steps. As you ascend, sections can be paved, but also involve rougher terrain, steep grassy descents, and uneven ground. A significant part of the route follows the historic Mourne Wall.

Where can I park and access the trailhead for this loop?

The trail typically begins from Donard car park in Newcastle. This is the primary access point for the initial section along the Glen River.

Is the Slieve Commedagh and Glen River Loop dog-friendly?

While dogs are generally permitted in the Mourne Mountains, it's essential to keep them on a leash, especially due to livestock grazing and for their safety on challenging terrain. Be prepared for sections with exposed rock and steep ascents that might be difficult for some dogs.

What is the best time of year to hike this trail?

Spring, summer, and early autumn generally offer the best conditions for hiking this loop, with longer daylight hours and more predictable weather. However, the trail offers spectacular scenery year-round. Be prepared for rapidly changing weather conditions at any time of year in the Mournes.

Are there any permits or entrance fees required for hiking in the Mourne Mountains?

There are no specific permits or entrance fees required to access the Mourne Mountains for hiking. However, parking at Donard car park may incur a fee.

What are the main viewpoints and highlights along the route?

The trail offers numerous highlights. You'll pass the picturesque Donard Park Waterfall and the Ice House, Slieve Donard. From higher elevations, enjoy panoramic views of Newcastle, Dundrum Bay, Slieve Croob, and the Murlough Nature Reserve. The Slieve Commedagh Summit provides outstanding vistas of the Irish Sea and many other Mourne peaks.

Does this loop intersect with other trails in the Mourne Mountains?

Yes, this route utilizes sections of several other well-known paths. It follows parts of the Glen River Trail, the Slieve Donard Trail, the Donard Loop, and the historic Mourne Wall Challenge.

How busy is the trail, and can I find solitude?

The initial approach via the Glen River can be busy, especially on weekends, as it's also a route for Slieve Donard. However, once you diverge onto the Slieve Commedagh loop, particularly sections like Shan Slieve and Slievenamaddy Ridge, you can often find splendid isolation and a proper mountain atmosphere without the crowds.

What should I bring for a hike on this trail?

Given the challenging nature and varied conditions, it's essential to bring appropriate gear. This includes sturdy hiking boots, waterproof and windproof layers, extra warm clothing, sufficient water and snacks, a map and compass (or GPS device), and a first-aid kit. Trekking poles can also be very helpful on steep or uneven sections.

Are there any facilities or water sources along the trail?

There are no facilities or reliable natural water sources directly on the higher sections of the trail. It is crucial to carry all the water and food you will need for the entire hike. You may find amenities like cafes and pubs in Newcastle before or after your hike.

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