Cross reference
Mark 5:20
20 And he went his way, and began to publish in Decapolis how great things Jesus had done for him: and all men marvelled.
Matthew 4:25
25 And there followed him great multitudes from Galilee and Decapolis and Jerusalem and Judaea and `from' beyond the Jordan.
Mark 7:31
31 And again he went out from the borders of Tyre, and came through Sidon unto the sea of Galilee, through the midst of the borders of Decapolis.