a lofty and extensive mountain range on the N.W. frontier of Arcadia, which it separated from Achaia and Elis. The highest points of this range are now called Olonos and Kalefoni, the former of which is about 7300 feet above the level of the sea, and the latter about 6250. Erymanthus is famous in the Greek mythology as the haunt of the wild boar whose destruction was one of the labours imposed upon Hercules by Eurystheus. Of the four streams which had their rise in Erymanthus, the Pirus and Selinus flowed northwards into Achaia, the Peneus westwards through Elis, and the cognominal Erymanthus southwards into Arcadia, where, after uniting with the Achelous, it joined the Alpheus.