“Under Salt Marsh” was filmed entirely on location in Wales, using several coastal and marshland areas to stand in for the fictional town of Morfa Halen.

Main filming locations

Here’s where “Under Salt Marsh” was primarily shot:

  • Anglesey (north-west Wales) – Key coastal and village scenes were filmed around Aberffraw, Newborough Forest, Malltraeth, and Menai Bridge, providing the rugged shoreline and marshy landscapes for Morfa Halen.
  • Gwynedd coastline – Barmouth, Fairbourne, and Llanbedr (including nearby marshland and estuary areas) were used for promenade, beach, and storm‑lashed coastal sequences.
  • Fairbourne salt marsh & estuary areas – Fairbourne’s salt marsh, golf course, promenade car park, and nearby Mawddach Estuary locations were used for crime‑scene and tidal‑marsh shots.
  • Shell Island (near Llanbedr) – Utilised for quay, causeway, and marsh settings to emphasize the isolated, storm‑threatened environment around the town.
  • Wider Wales support locations – Production notes confirm the series was filmed entirely in Wales, with additional work across Anglesey, Barmouth, Fairbourne, and parts of South Wales under the support of Creative Wales.

Quick HTML-friendly facts

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Aspect Details
Where was "Under Salt Marsh" filmed? Entirely in Wales, mainly along the North and West Welsh coast.
Key counties Anglesey and Gwynedd, with some additional Welsh locations.
Notable towns/villages Barmouth, Fairbourne, Aberffraw, Llanbedr (Shell Island), Menai Bridge.
Fictional town in the show Morfa Halen (“Salt Marsh”), represented by a mix of these Welsh coastal locations.

Information gathered from public forums or data available on the internet and portrayed here.