Within the depth-psychology corpus, the sea functions as one of the most semantically dense symbols, sustaining a remarkable convergence of alchemical, mythological, and psychological meanings. Jung’s Mysterium Coniunctionis provides the foundational lexical anchor: the sea is simultaneously synonym for the prima materia, the aqua permanens, the unconscious itself, a seat of hell, and the medium of both dissolution and regeneration. Edinger, elaborating Jung, traces the patristic tradition in which the sea is declared ‘the world’ and ‘the essence of the world, subject to the devil,’ while also serving as the terrain of the individuation journey—the Red Sea crossing that leads not to paradise but first to the bitterness of Marah. Abraham’s alchemical dictionary confirms the sea as mercurial water, the formless maternal vessel from which all forms emerge. Von Franz and Neumann extend the symbol into creation-myth territory, linking the primal ocean to uroboric origins, oceanic wisdom, and the unformed images that artists midwife into birth. The Greek mythological tradition—Kerényi, Burkert, Otto—situates the sea within the domain of Poseidon, Nereus, Proteus, and the sea goddesses, as a realm of primordial power, prophecy, and uncanny transformation. The sea as an image of inner life, of passion and calm, is equally articulated in Padel’s reading of tragic imagery, where the untroubled mind is ‘windless sea-calm’ and emotional disturbance is the sea whipped by gale. Across these registers, the sea remains irreducibly ambivalent: generative ground and devouring abyss, symbol of unconscious depth and vehicle of spiritual crossing.