🇳🇱 Netherlands · Buried city
Saeftinghe – Drowned Land of the Scheldt, Zeeland
Medieval (1230–1584 CE) · Flemish / Dutch / Zeelandic
Scheldt viscountcy drowned 1404–1584 — 55 km² peat polder with 4 villages now Europe largest salt marsh at +0.5 m.
🇬🇧 United Kingdom · Submerged site
Cantre'r Gwaelod (Lowland Hundred) – Welsh Sunken Land
Legendary 6th c. (Gwyddno) / literary 13th–15th c. · Welsh Celtic / Cumbric
16 villages west of Wales — dyke-keeper Seithenyn's drunken neglect floods lowland; causeways are glacial moraines.