- a description (e.g. size, order, discharge, flow rate, morphometric or regime characteristics etc) of the water bodies that are situated in some region
- a knowlege and technology domain related to the methods of measurements and researches of the water bodies
Not to be confused with hydrology. Hydrology studies the hydrological processes at the "low level" while Hydrography describes the spatiotemporal distribution of water bodies and their features.