Iolo's River Valleys
Iolo's River Valleys is a TV show on BBC2. Iolo Williams explores Wales’s most stunning river valleys from sea to source, uncovering their hidden wonders and remarkable wildlife. The program has been available since 2025. A total of 5 episodes have been broadcast, most recently in May 2026.
Last episode
Iolo's River Valleys
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.
Catching up on Iolo's River Valleys?
Don't want to miss an episode anymore? Set up a free alarm and receive an email when new episodes are available. Handy!
Iolo Williams explores the Usk valley, from Newport’s urban wildlife to ground-nesting birds, a huge lesser horseshoe bat roost and scarce firecrests.
Series 1
Iolo Williams explores the Vale of Clwyd, from coastal lizards and rare butterflies to a tame raven and elusive red squirrels, uncovering the valley's hidden wonders and wildlife.
Iolo explores fascinating woodlands, searches for curlew chicks and uncovers the history of an ancient burial chamber nestled in the beautiful Conwy valley.
Iolo Williams explores the Dyfi Valley, from the Ynyslas dunes and the Cors Fochno bog to ospreys at Cors Dyfi and wild beavers near Machynlleth.