Hydro-geography is the subject describing all water flows on and beneath the earth. Hydro-geography is part of physical geography; it is focussing on interactions among landscapes and water balance of a determined area.

The hydro-geography deals specifically with

• the water balance
• the spatial and temporal changes of water storage and
• the flow behavior with regard to the quantitative aspects, as well as the
• water quality in terms of qualitative aspects. 

Of special interest is the human intervention in the water systems [2].