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I've always been under the impression that Sauron's immediate awareness had entirely to do with Frodo's proximity to Mt. Doom and the fires where the Ring was forged. Indeed, I've always assumed that it was the mere act of putting the Ring on while standing before those fires that alerted Sauron. It's clear that the Ring's power becomes stronger and stronger as Frodo approaches the mountain, and it seems to me that this effect is sufficient to explain its maker's heightened awareness.
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