![](https://i0.wp.com/www.ocf.berkeley.edu/~skylerlewis/wp-content/uploads/2021/01/ca_watersheds3.png?w=840&ssl=1)
- US HUC-6 watershed bounds/names: USGS Watershed Boundary Dataset
- Canada/Mexico drainage basins: USGS North American Atlas
- Elevation: Conservation Biology Institute, 30″ DEM via Data Basin
- River features, outlines, and shaded relief: Natural Earth (10m)