From the encyclopaedia of arda:
Quote:
'Flame' is a reference to its nature as a fire-demon, while 'Udûn' was the name of Morgoth's oldest and greatest fortress in the north of the World, more commonly called Utumno, and the Balrog's ancient home.
There is no direct connection between this 'Udûn' and the rounded valley to the northwest of Mordor with the same name. There is an indirect connection, though: that region also took its name from the stronghold of Sauron's master.
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