<P> The Battle of Actium was the decisive confrontation of the Final War of the Roman Republic , a naval engagement between Octavian and the combined forces of Mark Antony and Cleopatra on 2 September 31 BC , on the Ionian Sea near the promontory of Actium , in the Roman province of Epirus Vetus in Greece . Octavian 's fleet was commanded by Marcus Vipsanius Agrippa , while Antony 's fleet was supported by the power of Queen Cleopatra of Ptolemaic Egypt . </P>
where did the battle of actium take place
on the Ionian Sea near the promontory of Actium