This document describes several locations from Arthurian legend, including Llyn Barfog where Arthur killed the monster Avanc, Llyn Dinas where Owein battled a giant, the sunken island of Lyonesse ruled by Tristan's father, Merlin's Cave where Merlin saved infant Arthur, Roche Rock which was a refuge for the lovers Tristan and Isolde, and St. Govan's Chapel where the saint Govan was protected from pirates by stones that opened around him.