Iolo's River Valleys
Iolo Williams explores four of Wales’s most stunning river valleys from sea to source, uncovering their hidden wonders and remarkable wildlife.
Series 2
Iolo Williams explores four of Wales's longest river valleys from sea to source.
1. Usk
0.0May 6, 2026 · 29 minIolo Williams explores the Usk valley, from Newport’s urban wildlife to ground-nesting birds, a huge lesser horseshoe bat roost and scarce firecrests.
2. Tywi
0.0May 13, 2026 · 29 minIolo Williams explores the Tywi river valley, from Llansteffan’s coastal dunes to fallow deer ruts, ancient oak woodlands, and the remote heights of the Tywi Forest.
3. Teifi
0.0May 20, 2026 · 29 minIolo explores the Teifi river valley, and finds a slow worm hunting, meets a coracle fisherman, is thrilled by a fishing Otter, and watches a pair of kestrels at their nest.
4. Dee
0.0May 27, 2026 · 29 minIolo explores the stunning Dee valley, from wintering birds along the estuary, to displaying black grouse on moorland, rare freshwater-pearl mussels, and spawning sea trout.