South Ridge and Watkin Path loop on Yr Wyddfa (Snowdon) — Trail Running in Eryri (Snowdonia)

Yr Wyddfa's (Snowdon's) south ridge is known as the Connoisseur’s Route, taking in 1.2 miles (2 km) of stunning rocky ridgeline en route to the summit. It’s even better when combined with a descent of the Watkin path, creating a memorable run on the southern flanks of Wales' highest mountain.

This is a terrific route, but also one of the most challenging on the mountain. Starting at about 164 feet (50 m) above sea level in the picturesque Nantgwynant valley, there’s more ascent than any of the other main summit routes. Both the ascent of the South Ridge and the top section of the Watkin path descent involve steep, rocky sections; the South Ridge may require some hands-on scrambling, with plenty of exposure. Relatively achievable in dry, calm conditions, it's a serious undertaking in poor weather. Under winter conditions this is a mountaineering route requiring specific skills and equipment and shouldn’t be attempted at a run.

Start at the large marker stone at the start of the Watkin path, ascending through ancient oak woodland and onto the mountainside. The South Ridge begins at Bwlch Cwm Llan, scrambly at first but getting less technical as you climb higher. The ridge is great, narrow with awesome views but never actually very hard.

The summit stretch joins the Rhyd-Ddu path, traversing the narrow Bwlch Main ridge to the summit of Yr Wyddfa. From here, the descent takes in the rocky ridgeline to Bwlch Ciliau, following the Watkin path downhill back into Cwm Llan.

This route is served by the Sherpa bus from Porthmadog, alighting at the Pont Bethania bus stop. If you choose to drive there's plenty of parking at the start of the route. Please use the paid parking at Pont Bethania Snowdonia National Park car park, which helps maintain the paths you’re running on.

The Hafod Y Llan National Trust campsite is close to the start of this route, a lovely place to stay and very handy for exploring the area. For kit, cafes, pubs, supplies and more accommodation choice Beddgelert is closest. There aren’t any refreshment stops on this run except for the summit café, which is open seasonally, so take food and drinks with you. It’s always worth carrying emergency kit on a mountain run, including a warm layer, emergency bivi bag, small first aid kit, torch, whistle and compass.