IPA: /haɪˈdrɒɡrəfi/
KK: /haɪˈdrɒɡrəfi/
The study and mapping of bodies of water, including their characteristics and distribution.
Hydrography is essential for understanding the geography of lakes and rivers.
Hydrography is formed from "hydro-" (from Greek "hydor", meaning water) and "graphy" (from Greek "grapho", meaning to write or describe). The word refers to the description or mapping of water bodies.
Think of 'water' ('hydro-') being 'described' ('graphy') — that's what hydrography means.