BAVO(Plin. Nat. 3.26. s. 30), or BOA (Cod. Theod. 16. tit. 5. s. 53; also Boae, Ammian. 22.3; Boia, Ant. Itin. p. 523, Wess.: Bua), an island off the coast of Dalmatia in Illyricum, used as a place of banishment under the emperors.