Cross reference
Mark 5:20
20 And he went on his way, and made public in the country of Decapolis what great things Jesus had done for him: and all men were full of wonder.
Matthew 4:25
25 And there went after him great numbers from Galilee and Decapolis and Jerusalem and Judaea and from the other side of Jordan.
Mark 7:31
31 And again he went out from Tyre, and came through Sidon to the sea of Galilee, through the country of Decapolis.