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Relation: subclass

WaterArea16A body which is made up predominantly of water, e.g. rivers, lakes, oceans, etc.^
Waterway10Waterway is the class of navigable waters, including Oceans, SeaLanes, Rivers, Canals, ...^
    Harbor1Harbor is the subclass of WaterAreas that provide shelter and anchorage for WaterVehicle.^
        DeepDraftHarbor.DeepDraftHarbor is the subclass of Harbors that have a waterDepth sufficient to accommodate v...^

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