"River catchments" refers to the land area that drains water into a particular river or body of water. It is like a basin or a natural collection area where rainwater, streams, and tributaries flow into the same river. Full definition
Almost half the area cleared was in river catchments near the Great Barrier Reef, increasing the flow of sediment onto offshore corals. (smh.com.au)
Climate Change Impacts, Local Knowledge and Coping Strategies in the Great Ruaha River Catchment Area, Tanzania (scirp.org)
Upper Goulburn River Catchment Association's Jan Beer said the Constraints strategy — which aimed to ease restrictions on river flows - was neither feasible nor achievable. (stockandland.com.au)