🇬🇧 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.