What follows is epitomized from H24H 10§30. The cosmic river Okeanos is situated at the outermost limits of the world, which is encircled by its stream. The circular stream of the Okeanos flows eternally around the world and eternally recycles the infinite supply of fresh water that feeds upon itself: see I.14.246–246a, I.18.399, I.20.065. This mystical river Okeanos, surrounding not only the earth but even the seas surrounding the earth, defines the limits of the known world. Every evening, as the sun sets at sunset, it literally plunges into the fresh waters of this eternally self-recycling cosmic stream, I.08.485, and it is from these same fresh waters that the sun rises again every morning at sunrise, as here at I.08.421–423 as also at O.19.433–434. This cosmic river Ōkeanos, encircling the known world, is a boundary delimiting light from darkness, wakefulness from sleep, life from death. The movement of the sun both into and out from the waters of the Ōkeanos is envisioned as a cosmic model for an alternation between sleep and awakening, between death and rebirth.