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  2. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    This map of United States water resource subregion hydrologic units updated boundaries to include the ocean as well as the portions of the basins that cross international borders For the use of hydrologists, ecologists, and water-resource managers in the study of surface water flows in the United States, the United States Geological Survey ...

  3. Watersheds of North America - Wikipedia

    en.wikipedia.org/wiki/Watersheds_of_North_America

    The Atlantic Seaboard basin in eastern North America drains to the Atlantic Ocean; the Great Lakes-St. Lawrence basin in central and eastern North America drains to the Gulf of St. Lawrence on the Atlantic Ocean or to the Labrador Sea; the Gulf of Mexico basin in the southern United States drains to the Gulf of Mexico, a basin of the Atlantic ...

  4. Water resource region - Wikipedia

    en.wikipedia.org/wiki/Water_Resource_Region

    A water resource region is the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units as part of the U.S. hydrologic unit system. This first level of classification divides the United States into 21 major geographic areas, or regions.

  5. Continental Divide of the Americas - Wikipedia

    en.wikipedia.org/wiki/Continental_Divide_of_the...

    A detailed map of watersheds in North America; A detailed overview of isolated wetlands from the USFWS Archived 2006-05-15 at the Wayback Machine; Detailed article, maps, and boundary data from The National Atlas of the United States; Parting of the Waters: a creek that flows to two oceans

  6. National Hydrography Dataset - Wikipedia

    en.wikipedia.org/wiki/National_Hydrography_Dataset

    The NHD is part of the United States Geological Survey The National Map for the United States. The NHD is also linked with similar datasets representing the surface water for Canada and Mexico. The dataset primarily maps features a 1:24,000-scale, but in certain areas provides detail at 1:5,000-scale.

  7. Eastern Continental Divide - Wikipedia

    en.wikipedia.org/wiki/Eastern_Continental_Divide

    The divide nearly spans the United States from south of Lake Ontario through the Florida peninsula, and consists of raised terrain including the Appalachian Mountains to the north, the southern Piedmont Plateau and lowland ridges in the Atlantic Coastal Plain to the south. Water including rainfall and snowfall, lakes, streams and rivers on the ...

  8. List of river basins in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_river_basins_in...

    Map of major river basins. These are the major U.S. river basins in the U.S., as designated by the U.S. Water Resources Council. [1] Each of these river basins contain a number of smaller river basins.

  9. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    The unit catchments have linked hydrological code data or similar metadata to create a flow network, so flow pathways and connections can be determined via network analysis. [34] Watershed Boundary Dataset Subregions Map for the United States, created by the US Geological Survey