Departing from the coasts - The country or regions of Tyre.
Came unto the sea of Galilee - The Sea of Tiberias. See the notes at Matthew 4:18.
Decapolis - See the notes at Matthew 4:25. He did not go immediately into Capernaum, or any city where he was known, but into the retired regions around the Sea of Galilee. This was done to avoid the designs of the Pharisees, who sought his life.