File:Estuarine and coastal drainage regions for Alaska USGS.jpg

English: Description adapted from the USGS website: “Estuarine Drainage Area" and "Coastal Drainage Area" are hydrologic units based on watershed boundaries. The terms were defined and developed as part of the "Coastal Assessment Framework (CAF)" of the National Ocean Service, within the National Oceanographic and Atmospheric Administration (NOAA). For detailed definitions and explanations of these terms, visit the CAF website at: [1]. NOAA has yet to define Estuarine and Coastal Drainage Areas for Alaska. Regions for Alaska [as shown here] were delineated based on topography and existing hydrologic unit codes (HUCs). The notation CEETV refers to the Contaminant Exposure and Effects-Terrestrial Vertebrates Database, for which this map was created.

• Uploader notes that region 18, apparently representing the Colville River area and designated "Prudhoe Bay", does not actually drain into Prudhoe Bay. See File:Alaska level 6 hydrologic units.jpg, File:NPRA F1lg.gif and File:Alaska Public Lands Map4000x2255.png.