Well, we have no idea how big Utumno actually is. The actual size of the place was never adequately described. If Balrogs could hide in the deepest places of Utumno, then it has to be a really big place. I imagine that the Host of the West was very very big, so if they passed over some of the hiding places of these Balrogs and Minions, Utumno had to have been very big and convoluted.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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