יהושע, פרק כ״א, פסוק ו׳

The distribution of cities among the Levite families continues by shifting focus to the descendants of Gershon, the second major family within the tribe of Levi [ביאור שטיינזלץ]. Through a lottery, this family was granted a total of thirteen cities. These settlements were drawn from the designated territories of the tribes of Issachar, Asher, Naphtali, and half the tribe of Manasseh.

The cities provided by the half-tribe of Manasseh were specifically located in the region of Bashan. This geographic detail clarifies that the cities came from the segment of the tribe that had claimed its inheritance on the eastern side of the Jordan River [מצודת דוד, ביאור שטיינזלץ].