Entwives

[Eruanna]

In Letters 179 (#144) Tolkien said that the Entwives were probably destroyed by Sauron during the War of the Last Alliance. However he also said that he hoped that some may have survived, even though they would have been much changed:

Some, of course, may have fled east, or even have become enslaved: tyrants even in such tales must have an economic and agricultural background to their soldiers and metal-workers. If any survived so, they would indeed be far estranged from the Ents, and any rapprochement would be difficult -- unless experience of industrialised and militarised agriculture had made them a little more anarchic. I hope so. I don't know.

In Letters 419 (#338) he wrote:

As for the Entwives: I do not know. ... But I think it is plain that there would be for the Ents no re-union in 'history' -- but Ents and their wives being rational creatures would find some 'earthly paradise' until the end of this world: beyond which the wisdom neither of Elves nor Ents could see. Though maybe they shared the hope of Aragorn that they were 'not bound for ever to the circles of the world and beyond them is more than memory.' ....

However, he doesn't speculate as to where this 'earthly paradise' would be. Logically, Valinor would seem to be out of the question. Maybe the 'walking elm tree' that cousin Hal saw actually was an entwife. After all, the green and verdant Shire would seem like an 'earthly paradise' to the ents.