Lon Las Ogwen – an antidote to ‘going long’

Nant Francon

‘Going long’ has an enduring romance in cycling circles.

Pushing yourself, getting the miles in, emptying the tank. Cycling has a clutch of phrases for the act of going out for four, five, six hours; 70, 100, 120 miles.

But for me, and I imagine many others, the shorter and more interesting rides can often hold comparable joy and stay in the mind longer.

Around Christmas, my son Sam told me about Jack Thurston’s lovely ‘Lost Lanes Wales’, a book detailing 36 short or shortish day rides exploiting some of the best roads in Wales that you’ve probably never heard of.

One of the book’s many wonderful illustrations caught my eye – unmistakably the mighty glacial valley of Nant Francon in North Wales. Running from Llyn Ogwen north to Bangor, it is possibly the finest textbook example of a U-shaped glacial valley that you’ll find in the UK, flanked by the mighty Glyderau and Carneddau.

My brother and I have walked much in the area of late but I’ve never cycled there. However I was always curious when driving up the valley on the A5 – looking across the valley to the right, spying a narrow, sinuous lane followed the foot of the Glyderau from the Penhryn slate mine to Ogwen Cottage in the shadow of Pen Yr Ole Wen and Tryfan.


Turns out that this glorious lost lane is part of Lon Las Ogwen, an 11-mile, waymarked trail that begins at the pier of Porth Penrhyn on the Menai Strait and plies the old slate mine railway before meeting the lost lane on Nant Francon’s western flank.

Nant Francon valley and the Carneddau in low cloud.

I had to ride it. 11-miles there, 11-miles back. Many ‘proper’ cyclists would sniff at such a pittance of distance but for me, the experience of riding in such majestic country, steeped in interest, was more than enough to justify the 1hr 45min drive from Liverpool.

Sam accompanied me in the car, with his De Rosa carbon road bike on the roof next to my old Reynolds 531 Raleigh Clubman. At Porth Penrhyn we met Ian, with his eponymous steel Tierney and Sam’s twin brother Tom, on his carbon Ribble road bike.


I have to admit to being a little uneasy about the terrain ahead and my companions’ bike choices. The opening section of the route was on tarmac and gravel mixed-use path, before a slate road section through Penrhyn Slate Mine. Following this was a gravel road section before a final tarmac sector to Ogwen Cottage.

I needn’t have worried. The bikes handled the route with aplomb, with only one snakebite puncture for Tom on the slate road section.

The opening salvo of the ride was idyllic, following Afon Cegin, which after a month of rain was in spate, taking its own path around trees and over rocks in the lush, deep valley. With luck the trail was never inundated but at one point our path was blocked by a fallen tree, which most of us managed to negotiate with our dignity intact.

The graceful Ian Tierney. The path began to rise on the bed of the old narrow-gauge railway that once took slate from the mine down to the purpose built port of Porth Penrhyn. The steady gradient soon revealed the dramatic peaks of the Carneddau and Glyderau, with their highest tops shrouded in cloud. Soon though the terrain closed in once more. We passed through Tregarth and into the slate mine and were suddenly surrounded by millions of tons of glistening rock; the spoil heaps of a 1200ft deep mine than once ‘roofed the world’. 

Now the eerie sounds of zip wires from the old quarry’s Zip World pierced the air as we helped (or hindered) Tom, fixing his rear wheel flat. The road around the flank of the mine was rough and sinuous, bucking and weaving with short, savage climbs and descents that demanded full respect on tyres no wider than 28mm. 


After a final climb and drop, the ominous slate heaps were behind us and the full majesty of Nant Francon was unveiled. And to cap it all we had a virtually traffic-free lane to take us to the breached watershed at Ogwen Cottage.

We hammered along the gravel section, stones pinging from our tyres until we reached the tarmac. To our right Foel Goch, Mynydd Perfedd and Y Garn loomed. To our left across the valley, Carnedd Llewellyn and his brother brooded beyond the brash western crags of Pen Yr Ole Wen.

Our destination was the cleft between Pen Yr Ole Wen and the lower slopes of Y Garn, where the outdoor centre and YHA sits. However, to get there required surmounting a series of brutal rises, which more than made up for the ride’s lack of distance.

We heaved ourselves over the climbs and passed through the small wooded area at the head of the valley to arrive at Ogwen Cottage. So often have I been there as a walker at the start of my journey that to arrive as a cyclist, mid-journey was a funny thing.

We sat and chatted, drank coffee and ate Ian’s left-over Christmas cake before enjoying the mostly downhill freewheel back to Bangor, in time to catch the sunset over a placid Menai Strait.

Coffee at Ogwen Cottage. We could have extended the ride further and kept the ‘Lost Lanes’ theme alive. After a short road section passing Llyn Ogwen and the foot of mighty Tryfan, we could have turned onto the old coach road bridleway and followed it to Capel Curig, enjoyed a sit-down lunch at Pinnacle Café or Moel Siabod café a little further up the road. But daylight was in short supply and the 22 challenging and varied miles were enough. More than enough. Porth Penrhyn. Can't think of a better start and finish point for a bike ride.

Lon Las Ogwen


7 thoughts on “Lon Las Ogwen – an antidote to ‘going long’

  1. Just the kind of outing I love to do. I’d want to take all day to stop often and let the surroundings saturate my memory. Until I can get over there and try it myself, I can enjoy your adventures. Thank you.

  2. Pingback: Smile if you like gravel - Team Prevent Breast Cancer, powered by Endomag

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