Ai! Lá polin saca i quettar!
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Region is given as Doriathrin. The base is the word reg "holly tree", with perhaps the toponymical ending -ion "holly-land" or a plural genitive ending -ion (as in Quenya), having the meaning "(Land) of Hollies". Note that the name is unrelated to the English word "region (of land)", and thus is to be pronounced with a hard g. Compare Eregion.