"Southern hill" might refer to Amon Lanc, the hill in southern Mirkwood upon which Dol Guldur stood. Or just possibly the hill on which Edoras was built. If we need further south, the hill-like Minas Tirith, or even the headland of Dol Amroth.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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