Continental United States - illustration of clickable map showing major rivers and hydrologic regions

Detailed Description
The map shows major rivers (Strahler stream orders >4) of the continental United States and 2-digit hydrologic code boundaries (hydrologic regions). Stream data were acquired from the National Hydrography Dataset Version 2.1 (accessed April 14, 2023) and hydrologic code boundaries were acquired from the Watershed Boundary Dataset (accessed April 14, 2023).
Sources/Usage
Public Domain.