These collections of NetMap stream reaches, confluence-to-confluence streamlines, reach contributing areas, and reach contributing area valley bottoms within the YK basin are organized by major river region, and by HUC8 hydrologic units within those river regions. These files form the basis of the main data release items covering the entire YK basin, and were included as a separate zip files here for users with a specific area of interest who do not wish to download the entire YK dataset. Attribute fields are identical to the YK dataset, and include uRCA fields for all HUC8-level features. The field representing the uRCA ID in the shapefile facilitates join operations between tables of various stream attribute data and habitat potential model results. These attributes can be used for further analysis and/or visualization in a GIS. Users who download spatial data for an individual region should therefore also download the tabular data for the full YK dataset to join model results. For detailed metadata for the files in each major river region zip, please reference metadata for analogous data items in the full YK dataset. Attributes, processing steps, and and other information will be identical, since the full YK dataset is simply the combination of all the individual files found in the major river region zips.