ONUGNATHUS(Ὄνου γνάθος), the jaw of an ass,the name of a peninsula and promontory in the south of Laconia, distant 200 stadia south of Asopus. It is now entirely surrounded with water, and is called Elafonísi;but it is in reality a peninsula, for the isthmus, by which it is connected with the mainland, is only barely covered with water. It contains a harbour, which Strabo mentions; and Pausanias saw a temple of Athena in ruins, and the sepulchre of Cinadus, the steersman of Menelaus. (Paus. 3.22.10, 3.23.1; Strab. viii. pp. 363, 364; Curtius, Peloponnesos, vol. 2. p. 295.)