Frequently the Bible will have “summary statements,” such as is found regarding Jesus’ Galilean Ministry: ” Jesus withdrew to the sea with His disciples; and a great multitude from Galilee followed; and also from Judea, and from Jerusalem, and from Idumea, and beyond the Jordan, and the vicinity of Tyre and Sidon, a great number of people heard of all that He was doing and came to Him” (Mark 3:7-8, NASB).
Note Jesus “withdrew to the sea,” meaning the Sea of Galilee, which is really a fresh water lake fed by the Upper Jordan. Its surface is currently 696 feet below sea level. Here see a sunrise view I photographed last month:
I labeled this blank map to show all the sites mentioned in these two verses.
The text is saying that people from all of these areas came to hear and see Jesus when He “withdrew to the sea.” Mark records the above portion of Jesus’ ministry immediately before he narrates Jesus’ selection and appointment of the twelve apostles.