Coasts is a bad rendering.
The reference is to districts like Galatia and Phrygia, lying up from the sea - coast and farther inland than Ephesus . Certain disciples . Disciples of John the Baptist, who, like Apollos , had been instructed and baptized by the followers of the Baptist, and had joined the fellowship of the Christians . There they were, a small and distinct community about twelve in number, still preparing, after the manner of the Baptist, for the coming of the Lord . Something there was which drew the attention of the apostle immediately on his arrival.