The new Sky crime drama Under Salt Marsh has quickly become must-watch TV since its debut in late January. With Kelly Reilly of Yellowstone fame and Rafe Spall leading the cast, the show has already drawn 1.8 million viewers for its first episode, making it Sky’s strongest original drama launch since The Day of the Jackal . But while the tense story of a murdered schoolboy and a looming catastrophic storm keeps audiences on the edge of their seats, many viewers are asking the same question: Where did this gripping, atmospheric world come from? The answer, according to creator Claire Oakley, starts not with a plot point, but with a place she simply could not forget.
In a recent interview, Oakley revealed that the entire concept for the series was born from her personal connection to the north Wales coastline. She spent years visiting the area and became captivated by its raw, untamed beauty. This deep affection for the landscape is the heartbeat of the show, transforming the environment from a simple backdrop into a central character that drives the mystery forward.
More Than a Setting: The Landscape as a Story Engine
The idea for Under Salt Marsh did not begin with a character or a crime, but with a feeling. Claire Oakley spent a decade traveling to the north Wales coast and was struck by its unique beauty. “I remember when I first went there I had no idea somewhere that beautiful existed in the UK,” she explained during a BAFTA Cymru Q&A session. “I just totally fell in love with it and I really wanted to set something there” .
Her fascination zeroed in on the salt marshes themselves, those rare and ever-changing landscapes where land and sea meet. “They’re such a rare and unique place,” she said. “The tides come in, they come out, it’s ever-changing, it’s really muddy, but they’re stunning places that are so vital to the island” . This specific environment sparked the core “what if” question that became the foundation of the series. Oakley wondered what would happen if a crime were committed in such a precarious place. “What if we set a detective drama in a town that’s disappearing into the sea and they have to solve the crime before all of the evidence is washed away?” . This simple, brilliant idea—a ticking clock powered by nature itself—turned the Welsh landscape into the show’s primary plot mechanism.
From Real Places to the Fictional Town of Morfa Halen
While the town of Morfa Halen (which translates to “Salt Marsh” in Welsh) is fictional, it was carefully constructed from very real locations . Oakley did not just pick a spot on a map; she physically explored the area to find the right feeling. She was particularly inspired by places like Shell Island, a popular camping destination near Llanbedr, and the tidal causeways that connect coastal communities .
“I knew Shell Island quite well and that causeway there,” she said. This inspired the idea of a town perched precariously at the end of a road, a place that feels isolated and vulnerable. “I thought, ‘what if we set a community out on the end of a causeway in a very precarious position, kind of where no one should be building houses, but that’s also really idyllic and full of a warm, eccentric community that we will want to see saved’” . This concept gave birth to Morfa Halen, a town whose very existence is threatened by the very nature that surrounds it.
Where Was ‘Under Salt Marsh’ Filmed? A Tour of North Wales
To bring Morfa Halen to life, the production team filmed extensively across Gwynedd and Anglesey in north Wales. These real-world locations provide the gritty, authentic texture that makes the show so compelling .
- Fairbourne: This small coastal village in Gwynedd served as the primary filming location. The show utilized the Fairbourne Golf Club (transformed into an ice cream parlor and police incident room), the Promenade Car Park for seafront scenes, and various residential streets like Llewelyn Drive. The surrounding salt marshes were also used extensively .
- Barmouth and the Mawddach Estuary: The seaside town of Barmouth stands in as the main setting for Morfa Halen. Filming took place on the town’s promenade, the estuary, and at nearby farms, capturing the dramatic skies and sweeping coastal views .
- Anglesey: Locations here include the vast, atmospheric Newborough Forest, the village of Aberffraw, Malltraeth, and the Menai Bridge area .
- Llanbedr and Shell Island: The area around Shell Island was crucial for creating the look of the quay, causeway, and the marshland that gives the series its name .
To add to the authenticity, much of the cast is filled with acclaimed Welsh talent. Acting legend Sir Jonathan Pryce (known for The Crown and The Two Popes) stars as local farmer Solomon Bevan. He is joined by a host of familiar Welsh faces, including Julian Lewis Jones, Rhodri Meilir, William Thomas, and Kimberley Nixon .
A Tragic Reality: When Fiction Mirrors Life
The environmental threat in Under Salt Marsh is not just a dramatic device. It is rooted in a very real and urgent crisis facing some of the very places where the show was filmed. The fictional community of Morfa Halen fights for survival against the sea, mirroring the real-life battle of Fairbourne.
For years, the future of Fairbourne has been uncertain due to rising sea levels and increased flood risk. Experts have warned that the village could become one of the UK’s first communities to be “decommissioned,” with residents potentially becoming climate refugees as soon as the 2050s . The village is threatened by flooding from the sea, the Afon Mawddach, and groundwater, creating a “triple threat” . Plans have been discussed to eventually demolish homes and infrastructure and return the land to marsh.
Sir Jonathan Pryce spoke about this powerful connection. “It’s a thriller with an important message behind it,” he told the BBC. “There are real towns on the west coast of Wales under threat from the sea. The show reflects that kind of looming ecological crisis and the community’s fight to survive and be heard” .
This real-world danger adds a layer of gravity to the series. Kelly Reilly noted that the environment “is a character in itself,” reflecting both the fragility of the community and the emotional state of her character, Jackie Ellis .
Building the Mystery: Characters Forged by Place
Once Oakley had her setting—a beautiful, fragile town under a ticking clock—she built the human story to match. She populated Morfa Halen with characters whose lives are as tangled and complex as the marshland itself. The mystery revolves around two children: one who vanished years ago, and one whose recent murder reopens old wounds .
Oakley explained how she intertwined the characters’ fates with the environment. “I wanted to create a big knot between the crimes, the children and our two leads,” she said . This led to the creation of Jackie Ellis (Kelly Reilly), a former detective now living as a teacher in the town, haunted by the unsolved disappearance of her niece, Nessa. When the body of her young pupil, Cefin, is found, she is forced to work again with her old partner, Eric Bull (Rafe Spall), a man with his own complicated history with the town .
The pressure of the approaching “red-level storm” forces this estranged pair to confront their painful past while racing to find a killer. The evacuation of the town means suspects and evidence could literally be washed away at any moment .
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Where to Watch ‘Under Salt Marsh’
Under Salt Marsh is a six-part series that premiered on Friday, January 30, 2026 . New episodes are released weekly.
- In the UK: The series airs on Sky Atlantic and is available to stream on NOW .
- For international viewers: While a specific international release date on platforms like Paramount+ (home to Kelly Reilly’s Yellowstone) has not been officially announced, the series is a Sky Original. International distribution will likely follow through Sky’s partners or other streaming services in regions like the USA, Canada, and Australia in the coming months. Viewers should keep an eye on local listings for Sky content or platforms like Acorn TV or BritBox, which often acquire high-quality British crime dramas.
The show has already been praised for its atmospheric tension, strong performances, and its unique ability to make the landscape an integral part of the story . With its combination of a gripping mystery, a stellar cast led by Kelly Reilly and Rafe Spall, and the stunning yet threatening backdrop of the Welsh coast, Under Salt Marsh offers a viewing experience that is as thought-provoking as it is thrilling.
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