Iolo Williams
Self - Presenter
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Series SeasonSeason 2 episodes2026
Iolo's River Valleys
Series 2
Iolo Williams explores four of Wales's longest river valleys from sea to source.
Episodes
Each episode has its own detail page.
Episode 129 min2026-05-06
Usk
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 229 min2026-05-13
Tywi
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 329 min2026-05-20
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 429 min2026-05-27
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.