Iolo's River Valleys - Season 2

First aired: 5/6/2026 4 episodes

Iolo Williams explores four of Wales's longest river valleys from sea to source.

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Episodes

Episode 1

1. Usk

Aired: 5/6/2026

Iolo Williams explores the Usk valley, from Newport’s urban wildlife to ground-nesting birds, a huge lesser horseshoe bat roost and scarce firecrests.

Episode 2

2. Tywi

Aired: 5/13/2026

Iolo 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.

Episode 3

3. Teifi

Iolo 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.

Episode 4

4. Dee

Iolo 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.