AREA (SUB-AREA), HYDROGRAPHIC (Nevada)

Nevada's 14 major drainage Basins or Hydrographic Regions are divided further into 232 Hydrographic Areas (valleys) and 256 Hydrographic Areas and Hydrographic Sub-Areas as defined by the U.S. Geological Survey (USGS) and the Nevada Division of Water Resources, Department of Conservation and Natural Resources. See Basins (Nevada). (A listing of these Hydrographic Areas and Sub-Areas is presented in Appendix A-1 (listed sequentially by Hydrographic Area number and Hydrographic Region/Basin), Appendix A-2 (listed alphabetically by Hydrographic Area and Sub-Area name), and Appendix A-3 (listed alphabetically by principal Nevada county(ies) in which located).)