The first stage of an ambitious new hiking route that will link woodlands across Wales takes walkers into the wild hills above the valleys’ old mining villages

Bracken and heather ripple across the plateau. I exhale into the chill autumn air and my breath mists a view that reaches all the way to Gower and the ochre peaks of Bannau Brycheiniog (formerly the Brecon Beacons). Far below, the Ogmore valley’s terrace houses look like tiny constellations but up here on Tarren y Fforch, it’s just me and a few sheep taking springy steps between tufts of bilberries. If this corner of the south Wales valleys feels a long way from its coal mining past, that is, partly, the point.

I’m hiking the new Llwybr Coedwig Cymru Trail, or Wales Forest Trail. Running from Porthkerry Park, near Barry, to Pont Walby, close to Glynneath, this 50-mile (80km) pilot route is the first section of what the National Forest for Wales hopes will eventually be a trail linking woodlands across the length and breadth of Wales: a sylvan counterpart to the Wales Coast Path.