Ulmo and the Ring War

[Andsigil]

Originally Posted by Legate of Amon Lanc

Well, at least for the Sea of Núrnen, my personal belief is that this was a place where he really didn't have much, if any influence. Not only was it as close to Sauron as it could, but it was also an inland sea with seemingly no connection to the Belegaer. So no rivers, no flows connecting its waters to the Great Sea - it was probably a lake whose waters, from most part, evaporated and that was the only way the water got away from there.

I agree, and while I can't guess the motives of a fictional deity, I would think that Sauron's desecration of the Sea of Nurnen (not exactly an insignificant body of water) would earn him Ulmo's absolute hatred. Hence, his more active role in opposing Sauron.