Micah's recent answer contained the following quote from a conversation in ROTK between Treebeard and the Elves:
... But Galadriel said: "Not in Middle-earth, nor until the lands that lie under the wave are lifted up again. Then in the willow-meads of Tasarinan we may meet in the Spring. Farewell!"
Is there any detail from the rest of Tolkien's work on what "nor until the lands that lie under the wave are lifted up again" means? I thought that the Third Age's end was supposed to essentially be the end of magical things in Middle Earth.