Map & Elevation
About this Route
This out-and-back climbs Beinn an Òir, the highest of the Paps of Jura, from the Three Arch Bridge over the Corran River. The GPX measures 19.1 km, gains 1,259 m and gives a walking-time estimate of about 6 hours 53 minutes. Allow seven to nine hours: the long approach is notoriously wet and the upper mountain is steep, loose and tiring.
Follow the signed Paps Walk into Gleann an t-Siob. The path is faint in places and the ground around Loch an t-Siob can be saturated. Cross the loch outflow using the stepping stones only when they are safe, then continue towards the bealach between Beinn Shiantaidh and Beinn an Òir.
From the bealach, take the easier-angled ramp across Beinn an Òir's eastern flank. This avoids the much steeper scree on the mountain's southern side. Gain the northern end of the summit ridge and follow the old surveyors' path past traces of the Colby camp to the 785 m trig point.
Return by the same east-flank ramp and the route past Loch an t-Siob. Do not descend directly south towards Beinn a' Chaolais: that ground is steeper, rockier and far more awkward than the ascent. Navigation can be difficult in cloud because paths fade across the bog and quartzite. Carry full waterproofs, food, water and a map and compass. Check ferry times before travelling to Jura and leave plenty of daylight for the slow, wet walk back to the bridge.
The best route is to retrace your steps the way you came.
Walkhighlands
Route Waypoints
Park considerately north of the Corran River bridge and follow the signed Paps Walk inland.
Follow the faint path west through the glen; expect deep bog and slow progress.
Cross on the stepping stones only if water levels make them safe, then continue around the loch.
Keep west towards the bealach between Beinn Shiantaidh and Beinn an Òir.
Turn south-west onto the easier east-flank ramp; avoid the steep southern scree.
Gain the ridge near the old survey camp and follow the worn line south.
Reach the 785 m trig point and return by the same northern ridge and ramp.
Retrace the bealach, loch crossing and boggy glen to the Corran River.
Essential Tips
The direct southern descent is much steeper and rougher. Return exactly by the ascent route.
The approach to Loch an t-Siob is often saturated. Waterproof boots and gaiters are worth carrying.
The loch outflow may be unsafe after heavy rain. Do not force the crossing if water is high.
Jura travel limits the available day. Check sailings and leave a generous daylight margin.
Frequently Asked Questions
How long does it take to climb Beinn an Òir?
Allow seven to nine hours for the round trip. The route is 19.5 km with 1,045 m of ascent, but the long approach through boggy ground is slow and the upper mountain is steep and tiring.
Can I cross the stepping stones at Loch an t-Siob when it's been raining?
No, don't force the crossing if water levels are high after heavy rain. Only use the stepping stones when they're safe — if in doubt, turn back.
Is it okay to descend the south side of Beinn an Òir instead of retracing my steps?
No, don't descend directly south towards Beinn a' Chaolais. That ground is much steeper, rockier and more awkward than the ascent route — stick to the same east-flank ramp you came up.