Narrated by Rob Brydon, this four-part documentary brings Eryri National Park (Snowdonia) to life in an extraordinary journey through the changing seasons.

Follow a different season each episode, capturing the park's breathtaking transformation across the year, from the stillness of autumn to the extremes of winter, from the first stirrings of spring to the full, sun-drenched swing of summer.

We meet the people and animals that have made these mountains their own, from the feral ponies and goats that have roamed here for centuries, to the hill farmers herding sheep and welcoming new lambs each spring, and the engineers who keep the Snowdon Mountain Railway's steam locomotives climbing to the summit of Yr Wyddfa.

Spanning over 800 square miles, from dramatic mountain peaks to miles of golden coastline, Eryri draws nearly four million visitors each year. Captured through breathtaking aerial cinematography and the voices of those who live there, this is a celebration of a landscape in constant motion, shaped by weather, by history, and by the people who call it home.