Map & Elevation
About this Route
This out-and-back climbs Beinn a' Chaolais, the southern Pap of Jura, from the Three Arch Bridge over the Corran River. The GPX measures 13.1 km, gains 1,126 m and gives a walking-time estimate of about 5 hours 9 minutes. Allow six to eight hours: much of the approach is pathless and boggy, followed by a very steep climb on loose quartzite.
Leave the bridge area and follow the recorded line north-west across the open moor. There is no continuous path to rely on, so use the mountain's south-west spur as the main handrail and keep checking the map rather than following animal tracks. Burns and peat hags can force small detours, particularly after wet weather.
At the foot of the spur, the gradient increases quickly. Climb the broad lower ridge, choosing firm grass where possible before the surface becomes increasingly stony. The upper section crosses loose quartzite scree and boulders, where progress is slow and the descent line is worth noting. Continue to the 733 m summit, which is marked by a cairn and has wide views over the other Paps and the Sound of Islay in clear weather.
Return by exactly the same south-west spur. This guide does not continue to Beinn an Òir or Beinn Shiantaidh and does not form the full Paps round. Cloud can make the rounded lower ridge difficult to identify from above, so take a bearing before descending. Carry waterproofs, gaiters, food, water and independent navigation, and check Jura ferry times before committing to the walk.
The summit is not hard to identify; finding the right line back across the moor is the part that deserves attention.
TrailTrack
Route Waypoints
Park considerately near the Corran River and begin on the recorded line north-west towards the open moor.
Leave clearer ground behind and keep a bearing across wet, pathless terrain. The south-west spur is the main feature to aim for when animal tracks fade.
Choose safe crossing points and expect small detours after rain; rejoin the recorded line beyond.
Continue north-west, using the south-west spur of Beinn a' Chaolais as the main visual guide.
Reach firmer rising ground and begin the sustained climb away from the bog. Look back now and note the line across the moor for the return.
The ridge steepens over loose scree and boulders; note the descent line as you climb.
Reach the 733 m summit and turn back along the same south-west spur. Do not continue towards the other Paps, as that becomes a much longer undertaking.
Retrace the pathless moor and burn crossings to the Corran River. The bridge is not visible for much of the descent, so keep checking the bearing.
Essential Tips
There is no dependable path across the moor. Take a bearing and use the south-west spur as a handrail.
Bog, peat hags and burns dominate the lower route. Waterproof boots and gaiters are useful.
Do not drop towards Loch an t-Siob or the other Paps. The GPX returns south-west to the bridge.
Loose pale scree is tiring uphill and slippery downhill. Keep the group close to avoid dislodging stones.
Frequently Asked Questions
How long does it take to climb Beinn a' Chaolais?
Allow six to eight hours for the full out-and-back route. The GPX gives a walking-time estimate of about 5 hours 9 minutes, but the pathless boggy approach and steep loose quartzite mean you'll need extra time.
Is there a path up Beinn a' Chaolais?
No, there's no continuous path to follow. You'll need to navigate across open, pathless moorland using the mountain's south-west spur as a guide and checking your map regularly.
Can I continue to the other Paps from Beinn a' Chaolais?
This route doesn't cover that — it returns down the same south-west spur. Continuing to Beinn an Òir or Beinn Shiantaidh becomes a much longer undertaking and isn't included in this guide.