Generate River Network from DEM || QGIS Generate Stream Network
In this tutorial, we'll go over the process of generating river networks from a Digital Elevation Model (DEM). From there, we'll illustrate the category or hierarchy for the rivers and finally view the data in a 3D environment using the QGIS2threejs plugin.
Digital Elevation Model (DEM) data sources:
Web GIS - http://www.webgis.com/terr_us75m.html
ASTER Global Digital Elevation Map - https://asterweb.jpl.nasa.gov/gdem.asp