I always thought that it was Sauron, who destroyed the Entwives when he created the Burnt Lands and not Morgoth. A few may have fled further East, but the majority of them would have lived east of the Anduin. There is even the implication that Sauron may have put them to use. This was Tolkien's view in around 1954.
I will have to look a bit further into the question of when the Ents and the Entwives separated.
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