[374] Portland-Islands, Gruppe zum Archipel New Britannia (Westliches Polynesien) gehörig.
Brockhaus-1911: Portland [3] · Portland [2] · Portland · Windward Islands · Western Islands · Queen Charlotte Islands · Channel Islands · Barrier Islands · Crooked Islands · Maldive Islands · Leeward Islands
Herder-1854: Portland Vase · Portland
Meyers-1905: Portland [3] · Portland [1] · Portland [2] · Portland [4] · South Portland · Sea Islands · Windward Islands · Western Islands · Solomon Islands · Crooked Islands · Barrier Islands · Fiji Islands · Queen Charlotte Islands · Leeward Islands
Pierer-1857: Portland [2] · Portland [1] · Portland-Vase · Portland-Head · Shiant Islands · Sherborough-Islands · Western-Islands · Windward Islands · Bonham Islands · Treasurers Islands · Turks-Islands · Verrader's Islands · East-Islands · Elizabeth Islands · Arroo Islands · Beaver-Islands · Hog's Islands · Pine-Islands · Farn Islands · Fox-Islands