Under Salt Marsh
Under Salt Marsh
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Under Salt Marsh

Under Salt Marsh is a British crime thriller television miniseries created by Claire Oakley and starring Kelly Reilly and Rafe Spall in the lead roles. Filmed in Wales, the series is set in the fictional North Wales village of Morfa Halen. The series premiered on 30 January 2026 on Sky Atlantic.

As a huge storm starts to form far out at sea, Jackie Ellis, a teacher and former detective, finds the body of her 8-year-old student, Cefin Hill, who appears to have drowned. This shocking discovery stirs up the town's memories of an unresolved case from three years earlier: the disappearance of Jackie's niece, Nessa. The failure to find the girl cost Ellis her police career.

Cefin's death brings back Jackie's former partner, Detective Eric Bull, to lead the investigation in a community where he had previously failed. Believing the two cases are connected, Ellis and Bull must work together to uncover hidden secrets in Morfa Halen before the storm hits and wipes away any evidence.

The six-part series is created by Claire Oakley, who also directs with Mary Nighy. Scott Bassett serves as the series producer while Oakley executive produces alongside Elwen Rowlands for Little Door Productions and Megan Spanjian for Sky Studios. Kelly Reilly was cast in the lead role in August 2024. In October 2024, the full cast for the series was announced, with Rafe Spall, Jonathan Pryce, Naomi Yang, and Harry Lawtey in main roles while the supporting cast includes Dinita Gohil, Brian Gleeson, Kimberley Nixon, Mark Stanley, Dino Fetscher, Lizzie Annis, Rhodri Meilir, and Julian Lewis Jones.

Filming began in October 2024, with the production taking place entirely in Wales. Locations used include Barmouth, Fairbourne, Anglesey, and South Wales. Support for the project comes from Creative Wales.

The six-episode series premiered on 30 January 2026 on Sky Atlantic.

Prior to the show's release, Nation.Cymru criticized the casting, due to the majority of main roles being filled by English actors, although the series was characterized as Welsh, and was set and filmed in Wales.

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