hydrography

hydrography is a   Noun

Definition:

[1] The art of measuring and describing the sea, lakes, rivers, and other waters, with their phenomena.

[2] That branch of surveying which embraces the determination of the contour of the bottom of a harbor or other sheet of water, the depth of soundings, the position of channels and shoals, with the construction of charts exhibiting these particulars.

Synonyms: