Synonyms for Catchment area:

n.

armpit, burbs, borough, block, agora, barrio, cantonment, cabbagetown, brownfield, area. beach, cape, coastline, bank, coast, bay, Bund, bight. catchment area (noun)
catchment basin, drainage area, drainage basin.
drainage basin (noun)
catchment basin, drainage area.
location (noun)
catchment basin, drainage area, drainage basin.

Other synonyms:

coastline, Bund. beach, cape, coast. bank. bay.