The Rhebas () was a very small river on the coast of ancient Bithynia, the length of which amounts only to a few miles (or km); it flows into the Euxine, near the entrance of the Bosporus, northeast of Chalcedon.Periplus of Pseudo-Scylax, p. 34; Dionys. Per. 794; Arrian, Periplus Ponti Euxini p. 13; Marcian, p. 69; This little river, which is otherwise of no importance, owes its celebrity to the story of the Argonauts.Orph. Arg. 711; Apollonius Rhodius, Argonautica, 2.650, 789. It also bore the names of Rhesaeus and Rhesus,Solin. 43. the last of which seems to have arisen from a confusion with the Rhesus mentioned by Homer.
Its site is identified with the Riva Deresi in Asiatic Turkey.
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