If you’ve been watching Under Salt Marsh and found yourself wondering where on earth they filmed all those moody coastal scenes, you’re not alone. The Sky Atlantic crime thriller has been turning heads with its sweeping Welsh vistas, and it turns out those dramatic salt marshes are very much real. Production designer Steve Herbert summed up the approach: “We cherry-picked elements from real places and built a town that felt authentic but also served the story.” The series filmed entirely in Wales starting in October 2024, with locations ranging from a seaside town of 2,500 residents to a national nature reserve.
Primary Locations: Barmouth and Fairbourne, north-west Wales ·
Estuary Stand-in: Mawddach Estuary for fictional Morfa Halen ·
Anglesey Sites: Newborough and Aberffraw ·
Gwynedd Areas: Fairbourne surrounded by Snowdonia National Park ·
Pub Location: Gazelle Hotel in Menai Bridge
Quick snapshot
- Barmouth and Fairbourne served as primary filming sites (Radio Times)
- Mawddach Estuary stood in for fictional Morfa Halen (Radio Times)
- Newborough Forest used for marsh scenes (Elle UK)
- Specific episode breakdowns for each Anglesey site (Radio Times)
- Exact causeway scene coordinates and timing (Radio Times)
- Full extent of Aberffraw filming beyond mention (Radio Times)
- Viewers can visit filming sites along North Wales coast
- Real marshes remain accessible despite erosion concerns
- Series now available to stream on Sky and NOW
Five distinct location zones make up the Under Salt Marsh universe: the primary north Wales coastline, the Mawddach Estuary estuary, Anglesey’s forest and village sites, the Gwynedd highlands surrounding Fairbourne, and the South Wales studio facilities used for interior sets.
| Fact | Detail |
|---|---|
| Fictional Setting | Morfa Halen, North Wales village |
| Premiere Date | 30 January 2026 on Sky Atlantic |
| Primary Region | North-west Wales |
| Key Estuary | Mawddach Estuary |
| Pub Site | Gazelle Hotel, Menai Bridge |
| Series Length | 6 episodes |
Where is Under the Salt Marsh filmed?
Under Salt Marsh was largely filmed in Barmouth and Fairbourne in north-west Wales, with the Mawddach Estuary standing in for the fictional town of Morfa Halen (Radio Times). Additional sites in Newborough, Aberffraw, and Menai Bridge on Anglesey rounded out the production footprint (Sky). The production designer told Sky that the team “cherry-picked elements from real places and built a town that felt authentic but also served the story” (Sky).
Barmouth and Fairbourne
Barmouth, a seaside town with 2,500 residents facing the Irish Sea at the foot of Snowdonia’s mountains, formed the backbone of the production (Elle UK).
Fairbourne in Gwynedd was used for aerial views of the village, located on the Mawddach Estuary in Snowdonia National Park with under 1,000 residents (Elle UK). The beach promenade and family-friendly seafront appear in various episodes as Morfa Halen, giving viewers sweeping views throughout the series.
Mawddach Estuary as Morfa Halen
The Mawddach Estuary provided the essential watery heart of the fictional Morfa Halen, appearing as the gateway to the series’ North Wales village (Radio Times).
The salt marshes, skies, and mountains combined to provide the natural drama the story needed, according to the production designer (Sky). Director Claire Oakley noted that the crew “did shoot out on a lot of real marshes,” lending authenticity that studio sets could never replicate (Radio Times).
Anglesey, known as “the Mother of Wales,” featured Newborough Forest to portray themes of global warming’s impact on marshes (Elle UK). With a 125-mile coastline featuring gold sandy beaches, the island offered dramatic settings the production clearly couldn’t resist (Elle UK).
The pattern is consistent across the production: real Welsh locations provided the foundation, with production carefully selecting sites that could stand in for different areas of the fictional Morfa Halen without audiences necessarily distinguishing between them on screen.
North Wales filming wasn’t just scenic window dressing—the rugged coastline and marshes became characters in their own right, shaping the story’s gritty, atmospheric tone that audiences have responded to.
Where is the Causeway in Under Salt Marsh?
The causeway in Under Salt Marsh connects to Welsh coastal areas around Gwynedd, where the production filmed amid Snowdonia National Park surroundings (Radio Times). While no specific causeway location has been pinpointed to individual episodes, the production utilized multiple coastal routes and estuary crossings throughout the six-part series (Sky).
Causeway scenes details
Causeway scenes were filmed on location using real Welsh roads and coastal paths rather than constructed sets, adding to the grounded, documentary-style atmosphere the production pursued (Radio Times). The production crew worked with local authorities to capture these sequences without disrupting traffic on working coastal routes.
Real-world stand-in locations
Multiple causeway references throughout the series draw from actual geography around the Mawddach Estuary and coastal Gwynedd, where causeways and sea walls are common features of the landscape (Elle UK).
The series depicts these infrastructure elements as both practical features and symbolic barriers between communities and the sea.
Where are the Causeway scenes filmed in Under Salt Marsh?
The trade-off for viewers hoping to visit exact filming spots: the production spliced together different locations, so the “causeway” viewers see on screen may blend elements from several real sites rather than one identifiable place. This composite approach means the dramatic coastal infrastructure viewers recognize from the series exists as a patchwork of Welsh geography rather than a single destination.
Where is the ship pub in Under Salt Marsh filmed?
The ship pub in Under Salt Marsh was filmed at the Gazelle Hotel in Menai Bridge, according to local reports (Radio Times). This North Wales pub location forms part of the broader Anglesey filming operation that also included Newborough and Aberffraw (Sky).
Pub interior and exterior
Both interior and exterior scenes for the pub were filmed at the Gazelle Hotel, with the production transforming the Menai Bridge venue to match the fictional ship’s needs of the series (Elle UK). The hotel’s real pub facilities provided a ready-made set that required minimal modification to serve the story.
Menai Bridge connection
Menai Bridge, the community on Anglesey connected to mainland Wales by the iconic Menai Suspension Bridge, provided a versatile filming base for the production (Radio Times).
The implication: if you visit Menai Bridge today, you might recognize spots from the series—but the production company hasn’t released a dedicated pub tour or location map.
The Gazelle Hotel’s starring role shows how Welsh hospitality venues have become go-to filming locations for productions seeking authentic pub atmosphere without the complications of building sets from scratch.
Where in Anglesey was Under Salt Marsh filmed?
Key Anglesey locations in Under Salt Marsh include Newborough and Aberffraw, where the production captured forest and coastal scenes that feature throughout the series (Radio Times). Shell Island and Llanbedr also appeared in the production, adding variety to the island’s representation on screen (Elle UK).
Newborough and Aberffraw
Newborough, a national nature reserve on Anglesey, featured prominently in scenes depicting global warming’s impact on marshes (Elle UK). The forest and surrounding dunes provided a wilder, more isolated feel that contrasted with the busier Barmouth and Fairbourne locations.
Aberffraw, one of the oldest villages in Wales, offered a historic backdrop for scenes requiring traditional coastal settlement atmosphere (Sky). The village’s name appearing in official production notes confirms its use, though specific episode appearances haven’t been detailed publicly.
Shell Island proximity
Shell Island, located near the main filming zone, added another layer of authentic coastal landscape to the production’s toolkit (Radio Times). The area’s designation as a popular camping site means visitors to the region can combine filming location tourism with regular seaside activities.
The catch: these Anglesey locations face genuine coastal erosion challenges, meaning the landscapes audiences see on screen may look different in coming years. The production captured these places at a specific moment in their transformation.
What the creators say
We cherry-picked elements from real places and built a town that felt authentic but also served the story. The salt marshes, the skies, the mountains — they gave us the natural drama we needed.
Steve Herbert, production designer
But we did shoot out on a lot of real marshes.
Claire Oakley, director and series creator
Confirmed facts
- Barmouth and Fairbourne filmed for main town scenes
- Mawddach Estuary stood in for Morfa Halen harbour
- Gazelle Hotel in Menai Bridge used for pub
- Newborough Forest used for marsh sequences
- Spider Island entirely studio-built
- Filming began October 2024 entirely in Wales
What’s unclear
- Specific episode-to-location mapping for Anglesey sites
- Exact causeway scenes and their real-world counterparts
- Full extent of Aberffraw filming beyond name mention
- Detailed Spider Island set construction specifics
Related reading: BBC Drops Blackshore Episodes – Full Season 1 on iPlayer · Charlotte Riley Movies and TV Shows: Complete List
Under Salt Marsh vividly captures Welsh coastal marshes much like The Bay Morecambe sitesThe Bay Morecambe sites, where ITV’s thriller leverages faded seaside allure for tension.
Frequently asked questions
What is the fictional village in Under Salt Marsh?
Morfa Halen is the fictional North Wales village where Under Salt Marsh is set. It was inspired by real Welsh coastal communities but constructed as a composite of Barmouth, Fairbourne, and surrounding areas rather than representing one actual place.
Is Under Salt Marsh set in a real town?
No, Morfa Halen is entirely fictional. However, it was filmed in real Welsh locations, primarily Barmouth and Fairbourne, using real marshes and established buildings like the Gazelle Hotel in Menai Bridge.
Which estuary doubles as Morfa Halen?
The Mawddach Estuary stood in for the fictional Morfa Halen’s harbour and surrounding waters. The production used this real estuary extensively to capture the authentic coastal atmosphere the story required.
Are Under Salt Marsh locations threatened by erosion?
Several filming locations in North Wales face ongoing coastal erosion challenges, particularly around Anglesey’s coastline and low-lying areas near the Mawddach Estuary. The production captured these landscapes at a specific point in their transformation.
What role does Snowdonia play in filming?
Snowdonia National Park surrounds Fairbourne, where aerial views were filmed for the series. The mountain backdrop provides dramatic framing for coastal scenes, with the production drawing on the contrast between sea and mountain landscapes.
How many locations in Anglesey?
Production notes confirm at least three Anglesey filming zones: Newborough Forest, Aberffraw village, and Menai Bridge for pub scenes. Shell Island and Llanbedr added coastal variety to the island’s representation.
Is the pub in Under Salt Marsh real?
Yes, the Gazelle Hotel in Menai Bridge is a real venue that served as the filming location for the main pub in Under Salt Marsh. Viewers can visit the actual hotel where interior and exterior scenes were shot.
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Sophie Marlowe is Culture & Lifestyle Editor at BritainNow.uk, covering arts, culture, lifestyle and society.