Maen Gwenonwy is a Dolerite Sill over Ordovician Rocks (mud/silt/sandstones).
A tidal island linked to Porth Cadlan by a causeway .
Maen Gwenonwy (Gwenonwy's Rock) is named after King Arthur's sister ,
according to legend - King Arthur fought his last battle at nearby Cadlan - “Battlefield”
and his mortally wounded body was taken by boat for burial on Bardsey Island -“Avalon”
Ref: NW 390
Date: 05/12/2021
Location: SH 198 260