*[http://water.usgs.gov/wsc ''Science in Your Watershed''], [[USGS]]
*[http://www.ericdigests.org/2003-1/ideas.htm ''Studying Watersheds: A Confluence of Important Ideas'']
*[https://web.archive.org/web/20040408040253/http://earthtrends.wri.org/maps_spatial/maps_detail_static.cfm?map_select=274&theme=2 Map of the Earth's primary drainage basins/watersheds], [[WRI]]
*[http://www.epa.gov/surf/watershed.html ''Surf Your Watershed''], [[EPA]]
*[https://web.archive.org/web/20120121122519/http://www.wr.udel.edu/cb/whatwhycare.html ''What is a watershed and why should I care?''] (University of Delaware – Water Resources Agency)