John Gill Commentary Joshua 13:28

"This is the inheritance of the children of Gad according to their families, the cities and the villages thereof." — Joshua 13:28 (ASV)

This [is] the inheritance of the children of Gad, after their
families
As described in (Joshua 13:27):

the cities and their villages;
the cities given them, some of which are mentioned by name, and the villages adjacent and belonging to them were included in them.