From there they sailed back to Antioch (in Syria)  ....
One of the city-states of The Decapolis, and a great centre of trade.
Tarsus was on the highway linking Syrian Antioch and the rest of the Middle East, with the provinces of Galatia and Asia to the west.(Acts continues) When Saul reached Jerusalem , he tried to join the disciples.
But they were all afraid of him, finding it impossible to believe that he was a disciple.
All Church members except the apostles were scattered over the countryside of Judea  and Samaria .
While reverent men buried Stephen and mourned deeply over him, Saul - Capital of modern Syria.