Across The Cynllaith Hillwalk

Event Overview

The Across The Cynllaith Hillwalk is open to walkers and runners. The event takes place on a route that crosses the Afon Cynllaith through fields, woods, lanes, and moorland, traversing hills on either side of the Shropshire-Mid Wales border. Both route options finish on the Offa’s Dyke National Trail.

Route Details

There are two route distances: 16 miles and 10 miles. Both routes start and finish in Trefonen and check in at Llansilin. The shorter route is circular, while the longer route adds another circle to form a figure of eight with Llansilin at its centre. Participants can choose their route on the day. The overall ascent on the 16-mile route is approximately 987 meters. Most participants take between 5 to 8 hours to complete the long route, including stops. The routes follow rights of way and paths with permission granted for the event day. The route will be well marked and supervised, with written directions provided as a backup. There are many stiles on both routes.

Event Logistics

Registration takes place at Trefonen Village Hall. Slower walkers must start early from 8:00 AM, while fast walkers and runners should start after 9:00 AM to ensure checkpoints are open. Registration closes at 9:30 AM. Checkpoints are located at Llansilin (mandatory for all), Craig Sychtyn, and the finish at Trefonen Village Hall. Participants must provide their entry numbers to checkpoint marshals. A cut-off time exists: walkers arriving at Llansilin after 12:00 PM will be directed to take the 10-mile route. A back marking team will walk the route from 9:30 AM to collect waymarking tape.

Facilities and Safety

Participants are advised to bring food, drink, and a cup or flask. Water will be available between Trefonen and Llansilin, at Llansilin (with tea, coffee, biscuits), at Craig Sychtyn, and at the finish (with tea, coffee, cake, savouries). Toilets are available at Trefonen and Llansilin village halls, and public toilets in Llansilin. Car parking is available at Trefonen Village Hall and the Playing Field car park. Dogs are welcome but must be kept under close control due to livestock. Weather can be variable, and participants are advised to bring wind and waterproof clothing and wear strong shoes or boots with grips. The event supports the Wales Air Ambulance Charity and War Child UK Charity.

Entry Information

Entry is limited to 300 participants. The entry fee for adults is £10 before Saturday 16th May 2026 and £15 thereafter. The fee for under-16s is £1. Under-16s must be accompanied by an adult. Entries close on Wednesday 20th May 2026. Visit the organization's website for the most recent information.