Mark 5:20

and he went away, and began to proclaim in the Decapolis how great things Jesus did to him, and all were wondering.

Matthew 4:25

And there followed him many multitudes from Galilee, and Decapolis, and Jerusalem, and Judea, and beyond the Jordan.

Mark 7:31

And again, having gone forth from the coasts of Tyre and Sidon, he came unto the sea of Galilee, through the midst of the coasts of Decapolis,

Treasury of Scripture Knowledge

Summary

And he departed, and began to publish in Decapolis how great things Jesus had done for him: and all men did marvel.

Bible References

Decapolis

Mark 7:31
And again, having gone forth from the coasts of Tyre and Sidon, he came unto the sea of Galilee, through the midst of the coasts of Decapolis,
Matthew 4:25
And there followed him many multitudes from Galilee, and Decapolis, and Jerusalem, and Judea, and beyond the Jordan.