The magical island where the Grail was taken after the quest was Sarras. In the Lancelot-Grail cycle, the successful Grail knights—Galahad, Percival, and Bors—travel there aboard Solomon’s ship after completing their quest.
Sarras is portrayed as a mystical place connected with the Grail’s sacred history. Joseph of Arimathea and his followers visit the island on their journey toward Britain, and Joseph’s son Josephus is consecrated there and shown the mysteries of the Grail. After the quest, Galahad dies in spiritual ecstasy when the Grail is taken up to Heaven, while Percival later dies as well; Bors returns to Arthur’s kingdom to report what happened.
Sarras is often mixed up with Avalon because both are magical islands in Arthurian literature. Avalon is associated chiefly with Arthur’s final journey and healing, whereas Sarras belongs specifically to the Grail narrative. Atlantis and Lyonesse come from different legendary traditions.