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Relation: subclass

direct-childrendocumentationgraph
LandForm44A LandForm is the class of geographically and/or geologically distinct areas that occur on Earth'...^
LowlandArea9A LowlandArea is a land area lower than the surrounding region, and usually level land.^
    Valley.A Valley is an area of low-lying land flanked by higher ground. Valleys typically contain a strea...^

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