Strabo, The Geography of Strabo, Volume 2…
“ It flows from the same places as the Eurotas. There is a village of the name of Asea in the Megalopolitis, where the two sources, whence the above-mentioned rivers issue, are near to one another. After running under the earth the distance of many stadia, they then rise to the surface, when one takes its course to Laconia, the other to the Pisatis. The Eurotas reappears at the commencement of the district Bleminates, flowing close beside Sparta, and passing through a long valley near Helos, which the poet mentions, empties itself between Gythium, the naval arsenal of Sparta, and Acræa. ”
