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  2. Hydrologic unit system (United States) - Wikipedia

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

    The 10-digit watersheds were delineated to be between 40,000 and 250,000 acres in size, and the 12-digit subwatersheds between 10,000 and 40,000 acres. [5] In addition to the hydrologic unit codes, each hydrologic unit was assigned a name corresponding to the unit's principal hydrologic feature or to a cultural or political feature within the ...

  3. Watersheds of North America - Wikipedia

    en.wikipedia.org/wiki/Watersheds_of_North_America

    Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydrological continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.

  4. List of U.S. states and territories by area - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    This is a complete list of all 50 U.S. states, its federal district (Washington, D.C.) and its major territories ordered by total area, land area and water area. [1] The water area includes inland waters, coastal waters, the Great Lakes and territorial waters.

  5. List of the largest counties in the United States by area

    en.wikipedia.org/wiki/List_of_the_largest...

    Unlike most states, Alaska is divided into boroughs and census areas that serve as county-equivalents for the Census Bureau. If included with the remainder of the counties and county-equivalent areas in the United States, Alaska's boroughs and census areas would occupy the largest 11.

  6. List of Great Basin watersheds - Wikipedia

    en.wikipedia.org/wiki/List_of_Great_Basin_watersheds

    Map of the Great Basin. The Great Basin is the largest region of contiguous endorheic drainage basins in North America, and is encompassed by the Great Basin Divide.This is a list of the drainage basins in the Great Basin that are over 500 sq mi (1,300 km 2), listed by the state containing most of the basin.

  7. North American Environmental Atlas - Wikipedia

    en.wikipedia.org/wiki/North_American...

    Information included in the Atlas includes accurate, seamless maps, documentation, and geospatial data that crosses political borders. This data is displayed as series of interactive map layers in an easy to use map viewer format. Most layers in the North American Environmental Atlas are at a scale of 1:1:10,000,000 or finer. [citation needed]

  8. List of drainage basins by area - Wikipedia

    en.wikipedia.org/wiki/List_of_drainage_basins_by...

    Basin Type Continent Drains to Basin area Notes km 2 mi 2; Atlantic Ocean: Ocean: Multiple: n/a: 106,000,000 41,000,000 [Note 1] [2]Arctic Ocean: Ocean: Multiple: n/a ...

  9. Category:Watersheds of the United States - Wikipedia

    en.wikipedia.org/wiki/Category:Watersheds_of_the...

    This page was last edited on 18 January 2019, at 14:57 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.