Afterwards I came into the regions of Syria and Cilicia ( ἔπειτα ἦλθον εἰς τὰ κλίματα τῆς συρίας καὶ τῆς κιλικίας); then I came into the regions of Syria and Cilicia. St. Luke tells us (Acts 9:30) that "the brethren brought him down to Caesarea, and sent him forth to Tarsus."
The verb "brought down" of itself indicates that the Caesarea here mentioned was Caesarea Stratonis, the seaport of Jerusalem, and not Caesarea Philippi towards Damascus (see Bishop Lightfoot on Galatians 1:21).
When, later, Barnabas required Saul's help at Antioch, it was to Tarsus that he went to seek him. It is, therefore, probable that, in mentioning "Syria" with "Cilicia" as containing "regions" (cf. Romans 15:23; 2 Corinthians 11:10) in which, after this departure from Jerusalem, he was actively engaged in ministerial work, he is thinking of the northern part of Syria, as in "Cilicia" he is thinking of the eastern portion of Cilicia about Tarsus; northern Syria and eastern Cilicia having a great geographical affinity.
It thus appears that the Epistle is in perfect harmony with the Acts. To the apostle's labours during this period that he was making Tarsus his head-quarters, was most probably due in no small measure the founding of the Churches in Syria, and especially in Cilicia, which are referred to in Acts 15:23, Acts 15:41.