WContinentWBoundaries between the continents of EarthWSupercontinentWAfricaWAmericasWAntarcticaWAsiaWAustralia (continent)WEuropeWFour continentsWIndian subcontinentWNorth AmericaWSouth AmericaWSubmerged continentWSunda (landmass)WTranscontinental railroadWZealandia
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