“Under Salt Marsh” was filmed across several real locations in Wales, mainly in the north-west of the country.

Main filming locations

  • Fairbourne, Gwynedd – A key base for the production, used for the seafront, sea wall, streets, and the salt marsh areas that inspired the show’s title.
  • Barmouth & the Mawddach Estuary – The estuary and surrounding coastline stand in for the fictional town of Morfa Halen.
  • Newborough Forest, Anglesey (Niwbwrch) – A 2,000‑acre coastal forest with dunes and marshland used for atmospheric coastal and marsh scenes.
  • Shell Island near Llanbedr – Used to depict the quay, causeway, and surrounding marshland, reflecting the show’s causeway‑across‑the‑marsh setting.

Quick HTML table of key locations

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Real location Region How it’s used in the show
Fairbourne Gwynedd, North-West Wales Primary village setting, seafront, sea wall, and salt marsh scenes for “Under Salt Marsh”.
Barmouth & Mawddach Estuary Gwynedd, North-West Wales Stands in for the fictional town of Morfa Halen and its surrounding estuary.
Newborough Forest (Niwbwrch) Anglesey, North Wales Provides coastal, dune, and marsh backdrops for several exterior scenes.
Shell Island (near Llanbedr) Near Barmouth, North Wales Used for quay, causeway and marshland sequences reflecting the storm‑threatened setting.

One-line takeaway

The fictional Morfa Halen of Under Salt Marsh is built mostly from real landscapes around Fairbourne, Barmouth/Mawddach Estuary, Newborough Forest on Anglesey, and Shell Island in north-west Wales.

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