Challenge Event

Wales / Monmouthshire

South Wales

51, 30 or 20ml. 24 hours for 51 mile event, 14 hours for 30 mile event and 9 hours for 20 mile event

10:00 (runners 11:00)

The Girl Guide Hall, Fairfield c.p, Abergavenny NP7 5TR (what3words - readjust.dented.point)

Cymoedd Sir Fynwy returns for 2026!
The LDWA’s toughest mountain event is back – now with a new 20-mile route option that also explores the Black Mountains. Tackle sections of the cancelled Y 100 Sir Fynwy & the classic Valleys 100 route.
Expect epic climbs through the Black Mountains such as Deri, Loxidge Tump & Skirrid via Cwmyoy, Llanthony & Pandy.
Then venture into Blaenavon’s World Heritage landscape, Coity Mountain, & finish along the Monmouthshire & Brecon canal.
Only for the fittest. Are you ready?

Free c.p available half a mile away at Byfield Lane c.p, Tudor Street, Abergavenny GR SO297141 (what3words - suspended.foreheads.dynamic) Entries only via SI Entries. Entries will open on 01.10.25 Entry limits per event 50 miles - 125 entrants 30 miles - 50 entrants 20 miles - 75 entrants

£40- 50 miles £27-30 miles £18-20 miles LDWA members. £55-50 miles £42-30 miles £33-20 miles Non LDWA members entry fee includes food at all checkpoints & a live tracker per entrant on the 50 mile event that will be used in the interests of safety due to the topography of the event. It will be a condition of entry that entrants on the 50 mile event must carry a tracker that will be provided at the start. Cancellations up to 28.02.26 refund less £10 admin fee. No refunds after 01.03.26