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This line shapefile represents the Continental Divide of the United States. The map layer was created by extracting Hydrologic Unit Boundary line features from an existing National Atlas layer. The source data are aligned with the individual 1:2,000,000-scale Digital Line Graph (DLG) hypsography files produced by the U.S. Geological Survey. This layer is part of the 1997-2014 edition National Atlas of the United States.