Reepicheep at the Very End Of The World

At the end of C.S. Lewis' 'Voyage of the Dawn Treader', Reepicheep takes his coracle and goes east towards the edge of the world.

"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."