We're not told precisely where the Ladybarrow was raised within Brethil, except that it was '...in the heights of the forest' (Quenta Silmarillion 17, Of the Coming of Men into the West). This is presumably a reference to the hill of Amon Obel, which appears to have been the only significant height within Brethil, though the 'heights' on which the barrow stood are not identified outright.
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