North American Atlas – Basin Watersheds

watershed_p_v2 North American Atlas – Basin Watersheds - Watershed polygon This collection is a legacy product that is no longer supported. It may not meet current governmentstandards. An area encompassing part or all of a surface drainage basin, a combination of drainage basins, or adistinct hydrologic feature. Watersheds are mapped in a hierarchical system, with the largest unitsencompassing the drainage areas of oceans, or of major rivers or river systems, and the subsequentlysmaller units within them encompassing the drainage areas of smaller rivers and streams. The North American Atlas – Basin Watersheds data set shows watersheds in North America at1:10,000,000. A watershed is an area encompassing part or all of a surface drainage basin, acombination of drainage basins, or a distinct hydrologic feature. Watersheds are mapped in ahierarchical system, with the largest units encompassing the entire drainage areas of major rivers orriver systems, or encompassing seaboard areas. Within these large units, subsequently smaller unitsencompass the drainage areas of smaller rivers and streams. Watersheds are classifi ed differently inCanada, Mexico and the United States; the data set includes a continental classifi cation (the NorthAmerican Watershed, or NAW level), as well as the classifi cation unique to each country. This data setwas compiled from each country’s watershed fi le and adjustments were made to the data to resolvemisalignments and mismatches across international borders.   Boundaries Canada Countries Hydrography Inland waters Lakes Mexico Mid-latitude North America Northern Hemisphere Rivers United States of America Water Watercourses Western Hemisphere EPSG:4326 -180.0 180.0 0.854865068354537 83.63339199980706 NRCan text/xml