Water occupies one of the most densely layered symbolic registers in the depth-psychology corpus, functioning simultaneously as cosmological element, alchemical arcanum, psychological metaphor, and theological allegory. Jung’s extended investigations establish the aqua permanens — philosophical water, aqua mercurialis — as a totality symbol coextensive with the prima materia, the Self, and the unconscious itself: in Zosimos, ‘the water is wholeness.’ Von Franz extends this: water in clinical dream-work signals the extractio of unconscious contents, life-giving or destructive depending on context. Neumann situates water as the primordial womb of the Great Mother archetype — containing, nourishing, transforming — while Hillman, following Heraclitus, insists that for souls ‘it is death to become water,’ orienting aquatic dream imagery toward the underworld rather than the maternal. Abraham’s dictionary surveys the astonishing proliferation of alchemical water-names — aqua vitae, fiery water, water of the wise, poison, permanent water — attesting to water’s supreme versatility as an operative substance. McGilchrist reads Schelling’s identification of water with dynamic equilibrium as a philosophical metaphor for reality itself, aligned with Taoist images of flowing. Across Taoist, I Ching, and alchemical traditions, the tensions cluster around water’s double valence: life and death, dissolution and regeneration, spirit and matter.