I don't have enough time to reply to the question, but I'd just like to add that Shelob's cave is in Mordor. Ungoliant's cave was south of Valmar in the Pelori 
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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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