We are bodies of water and bodies in air, steam and rain. We are hydro-flows, bodies whirling with ancient oceanic eddies and techno-waters. We are ecotones, or transitory zones, where body meets land meets water meets eye meets hand meets machine. Aqueous Humours are bodily fluids affecting our temperaments, encouraging laughter at the anthropocentric knowledge systems that ripple through the hydrological cycle. Fluid Ground is a watery mapping, which denatures cartography through practices of immersion, aquatics, time travel and the posthuman lenses of geological, animal and machine vision. This publication encompasses experimental nonfiction, fiction, diagram, scent and image. Kirsten Cooke has commissioned artists and writers into the flow of this publication through experimental nonfiction, fiction, diagram, cartography and image.