The case for Dorwinion being an Elvish realm (+ speculation about Bladorthin)

[Tar Elenion]

Originally Posted by Mithadan

Yes, even Pauline Baynes' poster map has Dorwinion at a similar location, just east of the Sea of Rhun. Tolkien was generally fond of her work.

The (green) annotation on this map is Tolkien indicating to her where she should place Dorwinion on the 'poster map'.