== Udûn vs Utumno == 

 I think it's better to keep the two articles separate; the only overlap of interest is Gandalf's phrase.  So I've moved material from the former to the latter, keeping links between them.  Also, it would be better not to rely on the Encyclopedia of Arda, as E of A has a habit of jumping to conclusions and not providing good references.  Do the work to find references in Reliable Sources (or raise the issue with {{cn}} and the Talk pages.  For primary material (plot, geography, etc.), primary sources are best, so that we know where Tolkien said such and such.  An obvious exception would be places where Tolkien was not clear, so that a good secondary source (like Foster or Hammond & Scull) clarifying the matter would be useful.)