Nevertheless, I am attracted to visual images and I find the following one fascinating because in it the sea-water behaves something like a superfluid. I will quote the whole passage from the PDF so that you can get the whole context.
--- The Voyage of the Dawn Treader[...] There was no need to row, for the current drifted them steadily to the east. None of them slept or ate. All that night and all next day they glided eastward, and when the third day dawned - with a brightness you or I could not bear even if we had dark glasses on - they saw a wonder ahead. It was as if a wall stood up between them and the sky, a greenish-grey, trembling, shimmering wall. Then up came the sun, and at its first rising they saw it through the wall and it turned into wonderful rainbow colours. Then they knew that the wall was really a long, tall wave - a wave endlessly fixed in one place as you may often see at the edge of a waterfall. It seemed to be about thirty feet high, and the current was gliding them swiftly towards it. You might have supposed they would have thought of their danger. They didn't. I don't think anyone could have in their position. For now they saw something not only behind the wave but behind the sun. They could not have seen even the sun if their eyes had not been strengthened by the water of the Last Sea. But now they could look at the rising sun and see it clearly and see things beyond it. What they saw - eastward, beyond the sun - was a range of mountains. It was so high that either they never saw the top of it or they forgot it. None of them remembers seeing any sky in that direction. And the mountains must really have been outside the world. For any mountains even a quarter of a twentieth of that height ought to have had ice and snow on them. But these were warm and green and full, of forests and waterfalls however high you looked. And suddenly there came a breeze from the east, tossing the top of the wave into foamy shapes and ruffling the smooth water all round them. It lasted only a second or so but what it brought them in that second none of those three children will ever forget. It brought both a smell and a sound, a musical sound Edmund and Eustace would never talk about it afterwards. Lucy could only say, "It would break your heart." "Why," said I, "was it so sad: " "Sad!! No," said Lucy.
No one in that boat doubted chat they were seeing beyond the End of the World into Aslan's country.
At that moment, with a crunch, the boat ran aground. The water was too shallow now for it. "This," said Reepicheep, "is where I go on alone."
They did not even try to stop him, for everything now felt as if it had been fated or had happened before. They helped him to lower his little coracle. Then he took off his sword ("I shall need it no more," he said) and flung it far away across the Idled sea. Where it fell it stood upright with the hilt above the surface. Then he bade them goodbye trying to be sad for their sakes but he was quivering with happiness. Lucy, for the first and last time, did what she had always wanted to do, taking him in her arms and caressing him. Then hastily he got into his coracle and took his paddle, and the current caught it and away he went, very black against the lilies. But no lilies grew on the wave; it was a smooth green slope. The coracle went more and more quickly, and beautifully it rushed up the wave's side. For one split second they saw its shape and Reepicheep's on the very top. Then it vanished, and since that moment no one can truly claim to have seen Reepicheep the Mouse. But my belief is that he came safe to Aslan's country and is alive there to this day.