The Magic Isle & Tol Eressëa : OK, after thinking about it, I agree to removing both of these so that our maps show one particular time period.
Eastland of Easterness: You're right, it does say "Eastland of Easterness". In Tolkien's original "of" is just a scribble on top of lines depicting the water. In your edited version I would just increase the font of the entire phrase "Eastland of Easterness". Hopefully that makes the "of" more clear.
The Anduin: Karen Wynn Fonstad has the path of the Anduiin slightly different (
http://www.theonering.com/galleries/...n-wynn-fonstad). I'm not saying she's definitely right, just using it as comparison. How do we know the Anduin flows into the Inland Sea?