what are geographic areas
catchment area, catchment basin, drainage area, drainage basin, river basin, watershed, basin-the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; flood control in the Missouri basin.atchment area, catchment basin, drainage area, drainage basin, river basin, watershed, basin-the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; flood control in the Missouri basin.