en_tn/mrk/05/20.md

Decapolis

This is the name of a region that means Ten Cities. It is located to the southeast of the Sea of Galilee. (See: rc://en/ta/man/translate/translate-names)

everyone was amazed

It may be helpful to state why the people were amazed. AT: "all the people who heard what the man said were amazed" (See: rc://en/ta/man/translate/figs-ellipsis)