DIAGON(Διάγων), a river separating Arcadia and Elis, and falling into the Alpheius on its left bank, nearly opposite the mouth of the Erymanthus. (Paus. 6.21.4.) It is conjectured by Leake to be the same as the Dalion (Δαλίων) of Strabo (8. p. 344), who mentions it along with the Acheron. (Leake, Morea, vol. 2. p. 89.)