3-567: The South Atlantic–Gulf 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 subdivide 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 South Atlantic–Gulf region, which
6-527: Is listed with a 2-digit hydrologic unit code (HUC) of 03, has an approximate size of 141,984 square miles (367,740 square kilometers ), and consists of 18 subregions, which are listed with the 4-digit HUCs 0301 through 0318. This region includes the drainage that ultimately discharges into: (a) the Atlantic Ocean within and between the states of Virginia and Florida ; (b) the Gulf of Mexico within and between
9-513: The states of Florida and Louisiana ; and (c) the associated waters. The geographic area of the South Atlantic–Gulf region includes all of Florida and South Carolina , and parts of Alabama , Georgia , Louisiana , Mississippi , North Carolina , Tennessee , and Virginia . 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
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