20 The Jordan formed the boundary on the eastern side. These were the boundaries that marked out the inheritance of the clans of Benjamin on all sides.

Read Joshua 18:20 Using Other Translations

And Jordan was the border of it on the east side. This was the inheritance of the children of Benjamin, by the coasts thereof round about, according to their families.
The Jordan forms its boundary on the eastern side. This is the inheritance of the people of Benjamin, according to their clans, boundary by boundary all around.
The eastern boundary was the Jordan River. These were the boundaries of the homeland allocated to the clans of the tribe of Benjamin.