
Iolo Williams explores four of Wales’s most stunning river valleys from sea to source, uncovering their hidden wonders and remarkable wildlife.
Documentary • Series • 2025 • 2 seasons
Starring: Iolo Williams

S1 E1 - The Rheidol Valley
Iolo Williams explores the Rheidol valley and looks for elusive pine martens. He’s also treated to views of red kites nesting in a village and explores a remote zinc mine.
May 6, 2025 • 29m

S1 E2 - The Dyfi Valley
Iolo Williams explores the Dyfi Valley, from Ynyslas dunes and Cors Fochno bog to Ospreys at Cors Dyfi and wild Beavers near Machynlleth.
May 13, 2025 • 29m

S1 E3 - The Conwy Valley
Iolo explores fascinating woodlands, searches for Curlew chicks and uncovers the history of an ancient burial chamber nestled in the beautiful Conwy Valley.
May 20, 2025 • 29m

S1 E4 - The Vale of Clwyd
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.
May 27, 2025 • 29m
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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.
Documentary • TV Series • 2025