river basin
basin **
watershed *
drainage basin
catchment area
catchment basin
drainage area

For quite a large catchment area, its results are well below average.

The school is open to all young people in the local catchment area.

The population of the hospital's catchment area is over 300,000.

The total catchment area of the river is 262 km2.

These programs are also open to students outside of the catchment area.

It has a catchment area of a little more than 35,000 km2.

With the growth of the park, the catchment area grew as well.

I think this is due more to the nature of the catchment area rather than the system.

These catchment areas, in particular, must play a central role, which is currently not the case.

The M25 is a big catchment area in terms of employment.