Series 2
4 episodes · May 6, 2026
Iolo Williams explores four of Wales's longest river valleys from sea to source.
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S2E1Usk
May 6, 202629mIolo Williams explores the Usk valley, from Newport’s urban wildlife to ground-nesting birds, a huge lesser horseshoe bat roost and scarce firecrests.
S2E2Tywi
May 13, 202629mIolo 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.
S2E3Teifi
May 20, 202629mIolo 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.
S2E4Dee
May 27, 202629mIolo 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.