Can't fault the logic and full marks for ingenuity but it isn't Inglor. the first bit is the "straight" clue. If it helps the river isn't in Middle Earth and sacred relates to it. the rest of the clue will give you the rest of the name.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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