U.S. Fish and Wildlife Service, Information Resource and Technology Management, Branch of Geospatial Data ServicesDigital ecosystem information portraying the location and boundaries of the ecosystems. The Service originally chose the U.S. Geological Survey's Hydrologic Unit Map as the foundation for delineating ecosystem unit boundaries on a national scale. Since that time, boundaries in some of the regions have been moved to the closest county boundaries to simplify management responsibilities. The current unit boundaries reflect this combination. Data Set Contact: U.S. Fish and Wildlife Service Natural Resource Program Center, GIS Team Lead, richard_easterbrook@fws.govArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/f48ddca72a7f433c9ca87e57911385a3_0engU.S. Fish and Wildlife Service Open DataPublicFWS HQ BA Ecosystem Regions [United States]Web servicesUnited StatesLast Modified: 2017-04-27