page_title: California water resource region
hierarchical_section_title: California water resource region
caption_attribution_description: English: Map of HUC18 - California Water Resource Region
context_page_description: The California water resource region is one of 21 major geographic areas, or regions, in 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. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.
  The California region, which is listed with a 2-digit hydrologic unit code of 18, has an approximate size of 168,579 square miles, and consists of 10 subregions, which are listed with the 4-digit HUCs 1801 through 1810.
  This region includes the drainage within the United States that ultimately discharges into the Pacific Ocean within the state of California; and those parts of the Great Basin that discharge into the state of California. Includes parts of California, Nevada, and Oregon.
context_section_description: The California water resource region is one of 21 major geographic areas, or regions, in 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. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.
  The California region, which is listed with a 2-digit hydrologic unit code (HUC) of 18, has an approximate size of 168,579 square miles (436,620 square kilometers), and consists of 10 subregions, which are listed with the 4-digit HUCs 1801 through 1810.
  This region includes the drainage within the United States that ultimately discharges into the Pacific Ocean within the state of California; and those parts of the Great Basin (or other closed basins) that discharge into the state of California. Includes parts of California, Nevada, and Oregon.
caption: The California region, with its 10 4-digit subregion hydrologic unit boundaries.
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