Alternatively known as a drainage area or catchment area, these refer to the areas drained by a specific outlet, such as a river or lake.
The Drainage Basin - My IGCSE years
Drainage Basin
Drainage Basin - Free ZIMSEC & Cambridge Revision Notes
Map of Ecuador showing location of Cajas National Park, as well as
St. Lawrence River Ecosystem - Save The River! Thousand Islands - Clayton NY on the St. Lawrence River
Drainage Basin
Gulf of Honduras - WorldAtlas
What Are Watersheds And Drainage Basins? - WorldAtlas
Watersheds and Drainage Basins
Endorheic Basin - WorldAtlas
Geography of Canada - Wikipedia
Connecticut River - WorldAtlas