Under Salt Marsh, the new British crime thriller, has just premiered on Sky Atlantic on January 30, 2026. The show is set in Morfa Halen, Wales. It follows Jackie Ellis and Detective Eric Bull as they investigate the murder of a young boy and how it might be connected to the disappearance of Jackie’s niece three years ago.The story of the show is set in a particular village in Wales, but it was filmed across various locations in the country. Let’s revisit the key filming locations of the British crime thriller.Where was Under Salt Marsh filmed?A lot of Under Salt Marsh was filmed in the actual coastal regions of Wales to ensure that the setting represented the reality of most coastal areas of the country. While Spider Island is a major location in the series, it does not exist in real life. The island was created inside a studio, where the production team built a group of wooden huts to make it seem as real as possible. This also allowed the creators to have more control over the setting while keeping the show visually realistic. View this post on Instagram Instagram PostFilming took place in both North and South Wales, with most of the marshland scenes shot in the north. The team worked with new location scouts who explored lesser-known areas. Their goal was to find landscapes that felt vast and overwhelming in order to highlight how small and isolated the communities are.Filming for Under Salt Marsh took place in Anglesey, especially Newborough Forest in Niwbwrch, known for its dunes, marshes, and coastal views. Fairbourne, a village near Snowdonia National Park, was also used for several scenes, including streets, seafront areas, and open marshland. Additional locations included Barmouth, the Mawddach Estuary, Shell Island in Llanbedr, and areas around the Menai Bridge.The synopsis of Under Salt Marsh, according to Sky, is:As a once-in-a-generation storm begins to gather far out at sea, former detective turned teacher Jackie Ellis discovers the body of her nine-year-old pupil, Cefin, seemingly drowned. The discovery sends shockwaves through the community, reviving the ghost of an unsolved cold case that rocked the town three years prior – the disappearance of Jackie’s niece, Nessa, which cost her career.Cefin’s death summons Jackie's former partner, Detective Eric Bull, back to Morfa Halen to lead the investigation into a community he failed once before. Convinced the cases are linked, Jackie and Bull must reconcile and race to uncover long-buried secrets inside Morfa, before the storm breaks and all the evidence is gone for good. View this post on Instagram Instagram PostUnder Salt Marsh stars Kelly Reilly as Jackie Ellis, Rafe Spall as Detective Eric Bull, Naomi Yang as Jess Deng, Harry Lawtey as Dylan Rees, Lizzie Annis as Cara Rees, Dino Fetscher as Gareth Evans, Brian Gleeson as Mac Jones, Dinita Gohil as Nisha Jones, Kimberley Nixon as Shell Hill, Mark Stanley as Danny Hill, Julian Lewis Jones as Osian Northam, Jonathan Pryce as Solomon Bevan, and Rhodri Meilir as Ned Bevan.Under Salt Marsh is created, written, executive produced, and directed by Claire Oakley. Mary Nighy is also a director on the show. Other than Oakley, Elwen Rowlands and Kelly Reilly also serve as executive producers. Scott James Bassett is the series producer. The production companies behind the show are Little Door Productions and Sky Studios.Under Salt Marsh episode 3 will be released on Sky and NOW on February 6, 2026.For more articles like this, follow Soap Central.