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Definition: Casgliad o domenni (ar sail ffactorau fel eu hagosatrwydd, hanes y safle a mynediad) y gellir eu grwpio at ei gilydd er mwyn manteisio ar effeithlonrwydd wrth reoli'r tomenni hynny.
Notes: Elfen o gyfundrefn arfaethedig ar gyfer rheoli tomenni glo.
