zone humide (1) vallée (1) fleuve (1) plaine (1) océan (1) écosystème aquatique (1) paysage (1) relief (1) eaux intérieures (1) information (1) pente (1) analyse (1) eau douce (1) écosystème (1) point (1) classification (1) abords (agglomération) (1) Afrique (1) The Valley (1) Development (1) Wetlands (1) Units of measurement (1) South Africa (1) Ocean (1) Landscapes (1) Hydrodynamics (1) Fresh water (1) Exchange (1) Classification (1) Biotic communities (1)