Aedepsus (mod. Loutra Aidepsou), Euboean coastal town dependent on Histiaea, famous in antiquity for its hot springs, known to Aristotle (Mete. 2. 366a) and still in use. It prospered in imperial times as a playground for the wealthy, equipped with luxurious swimming-pools and dining-rooms (Plut. Mor. 487 f, 667c). By ce 340 Aedepsus had attained city status (IG 12. 9. 1234b), replacing Histiaea as the chief city of northern Euboea. There are extensive Roman remains.