A cosmic ocean, primordial waters, or celestial river is a mythological motif that represents the world or cosmos enveloped by a vast primordial ocean. Found in many cultures and civilizations, the cosmic ocean exists before the creation of the earth. From the primordial waters the earth and the entire cosmos arose. The cosmic ocean represents or embodies chaos.
The cosmic ocean takes form in the mythology of Yazidism, Ahl-e Haqq, Alevism, Ancient Egyptian mythology, Ancient Greek mythology, Canaanite mythology, Ancient Hindu mythology, Ancient Iranian, Sumerian, Zoroastrianism, Ancient Roman mythology and many other world mythologies.
The primacy of the ocean in some creation myths corresponds to the cosmological model of land surrounded by the world ocean. The sky is often thought of as something like the upper sea. The concept of a watery chaos also underlies the widespread motif of the worldwide flood that took place in early times. The emergence of earth from water and the curbing of the global flood or underground waters are usually presented as a factor in cosmic ordering.