On the frontier of the provinces Asia and Bithynia. W. of Bithynia, E. of the Aegean, S. of the sea Propontis or Marmora, N. of Lydia. The site of Troy was in it originally, but not in Paul's time for he had to pass by Mysia to reach the Troad (Acts 16:7-8). On his second missionary journey he was not suffered by the Spirit to preach in Asia or Bithynia. He passed through Mysia, without staying, on to Macedonia. Assos and Adramyttium were in Mysia. The island Lesbos was opposite.