Not Crissaegrim, and not on the contiguous landmass that contains, at various times, Cuivienen, Nargothrond, Ost-in-Edhil, and Minas Ithil. Other continents or islands are fair game.
EDIT: Were it acceptable in the English language, the clue would have begun 'Twice gated' rather than 'walled'.
hS
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