Ramandu's island is a remembered Narnian location whose importance in the story lies chiefly in Eustace's account of a gesture performed there and in the island's place in his earlier travels with Aslan. That remembered journey becomes part of the evidence by which Eustace identifies himself to the rescued Prince Rilian.

A remembered point of reference

When Eustace suggests how to approach Aslan, he recalls the way the travelers acted on Ramandu's island: they stood side by side and held their arms out in front, palms down. He proposes that he and Jill repeat the gesture, and wonders whether they should face east. The recollection gives the island a practical, ritual association in Eustace's mind, though the passage does not explain the earlier occasion in detail. When Jill asks which island he means, Eustace postpones the story, saying that he will tell her another time.

Eustace's earlier eastern voyage

The island is also part of Eustace's history with Aslan. In the underground castle, when Rilian asks who the children are and how they came to seek him, Eustace identifies himself as someone who sailed with Aslan to Ramandu's island. The statement connects the rescue mission to an earlier voyage and supplies Rilian with a concrete basis for understanding who has come to his aid. The island thus enters the present plot not through a visit during the search, but through Eustace's account of a journey already made.

Place in the wider journey

Elsewhere, the narrative follows Jill and Eustace from the marshes into a harsher mountain country, then down into the underground darkness, where the travelers cross a subterranean sea and later flee rising water. Against those shifting environments, Ramandu's island belongs to the remembered geography of Eustace's eastern travels, not to the route of the search party. Its brief appearances link the children's immediate danger and purpose to a larger history of travel with Aslan, while leaving the island's landscape and inhabitants undescribed.