Why “hydrographia” is a great word
Hydrographia is the rhetorical technique of vividly describing bodies of water to create an illusion of presence. Its name is a learned borrowing from Ancient Greek ῠ̔δρογρᾰφῐ́ᾱ (hudrographíā), from ῠ̔δρο- (hudro-, “water”) + -γρᾰφῐ́ᾱ (-graphíā, “writing, description”). Unlike geographia—which maps the solid earth—or the broader vividness of ekphrasis, hydrographia is the specialized art of conjuring liquid into being. It is the silver flash of a herring shoal in a sudden current, the cold glint of a mountain lake at dawn, and the fretwork of foam on a breaker’s spent edge—an artful conjuration of wetness from dry text, reminding us that the oldest stories begin where light fractures on a restless surface.
Definitions & examples from Wiktionary (CC BY-SA 3.0).