In Book VIII, 37, Malory calls it an isle. In VIII, 38, he calls it also a valley and places it in Wales.
It was ruled by the evil giant Nabon the Black. Its capital was Glait Castle.
Nabon held a tournament there to celebrate the knighting of his son. Lamorat and Tristan both attended, and the latter slew Nabon and his son.
Afterwards, it was known as the Land That Tristan Freed, and was given to Sir Seguarades.