TETHYS was the Titan goddess of the sources fresh water which nourished the earth. She was the wife ofOkeanos, the earth-encircling, fresh-water stream, and the mother of the Potamoi (Rivers), Okeanides(Springs, Streams & Fountains) and Nephelai (Clouds). Tethys was imagined feeding her children’s streams by drawing water from Okeanos through subterranean aquifers. Her name was derived from the Greek wordtêthê, “the nurse” or “grandmother.”