DI´DYMI(Δίδυμοι), a town of Hermionis on the road to Asine, contained in the time of Pausanias temples of Apollo, Poseidon, and Demeter, possessing upright statues of those divinities. It is still called Dídyma, a village situated in a valley 2 miles in diameter. On the north-eastern side of the valley rises a lofty mountain with two summits nearly equal in height, from which the name of Didymi is doubtless derived. The valley, like many in Arcadia, is so entirely surrounded by mountains, that it has no outlet for its running waters, except through the mountains themselves. Mr. Hawkins found at the village a curious natural cavity in the earth, so regular as to appear artificial, and an ancient well with a flight of steps down to the water. (Paus. 2.36.3; Gell, Itinerary of Morea, p. 199; Boblaye, Recherches, &100. p. 62; Leake, Peloponnesiaca, p. 289; Curtius, Peloponnesos, vol. 1. p. 464.)