Map & Elevation
About this Route
This GPX follows the classic Glen River route from Donard Park in Newcastle to Slieve Donard, Northern Ireland’s highest mountain at 850 m. The out-and-back measures 9.4 km, gains 840 m and has a GPX-derived walking-time estimate of 3 hours 17 minutes.
The recorded line climbs through Donard Wood beside the Glen River, continues onto rough open mountain path and reaches the Donard–Commedagh saddle. From there it turns left and follows the Mourne Wall up the final steep stone-and-granite slope to the summit.
This is a strenuous climb from near sea level. The upper mountain is exposed, steep and liable to cloud, wind and rain; the wall is a landmark, not a substitute for navigation. Carry the GPX plus the OSNI Mournes Activity Map and a compass, and allow longer than the estimate for stops or difficult conditions.
The Glen River path is busy and clear, but the final climb beside the Mourne Wall is steep, rocky and exposed. At the saddle, turn towards Donard rather than following the wall towards Commedagh. The summit tower is a landmark, not guaranteed shelter, and cloud can hide the correct wall line on descent. Granite steps become slick in rain or frost, so leave time for a controlled return through the forest.
Slieve Donard’s granite peak dominates the Mourne Mountain range.
National Trust
Route Waypoints
Start in Donard Park at grid reference J 375 305. Follow the GPX south-west into the woodland and use the established bridges as the path changes banks beside the Glen River.
At roughly 300 m elevation, continue on the increasingly rough stone path as the trees give way to open mountainside. Stay on the restored line to reduce erosion and take care on wet rock.
Reach the saddle and the Mourne Wall. Turn left and follow the GPX beside the wall on the steep south-east-facing ascent; do not assume the wall alone will guide you safely in cloud.
Reach the 850 m summit beside the wall, tower and trig point. Confirm the correct north-east return line in poor visibility, then retrace the same GPX route to the saddle and Glen River.
Return beside the Mourne Wall to the Donard-Commedagh saddle, then turn down the Glen River path towards Newcastle.
Re-enter the forest and pass the old ice house. Wet stone and roots can be slippery late in the descent.
Descend the same recorded line to Newcastle. Take controlled steps on the steep upper stones and remain attentive on wet roots and rocks beside the Glen River when legs are tired.
Follow the main riverside path back to the car park. Ignore forestry tracks leaving the Glen River.
Essential Tips
Cloud, wind and rain can make the summit serious even when Newcastle is mild. Carry waterproofs, warm layers, the GPX, OSNI Mournes Activity Map and a compass and know how to use them.
The final climb beside the wall is steep and rough. Wear footwear with dependable grip, allow extra descent time and avoid rushing loose or wet granite steps.
Donard Park provides the established Slieve Donard parking area and toilet facilities. Arrive early on busy days, check current restrictions and never block access or local roads.
Sections of the Glen River and upper route have been restored to manage heavy use and erosion. Stay on the constructed line, use the bridges and do not widen braided shortcuts.
Frequently Asked Questions
How long is the Slieve Donard Glen River route?
The supplied GPX measures 9.4 km with 840 m of ascent. Its walking-time estimate is 3 hours 17 minutes, but allow longer for breaks, the steep descent, poor visibility or wet rock.
How difficult is Slieve Donard from Donard Park?
It is a strenuous mountain walk rising from near sea level. The upper route beside the Mourne Wall is steep and rough, and cloud, wind or rain can make navigation and footing significantly harder.
Where do I park, and which map should I carry?
Start at Donard Park car park in Newcastle, grid reference J 375 305, where toilet facilities are available. Carry the OSNI Mournes Activity Map at 1:25,000 plus a compass and the GPX.