“To the Gershonites according to their families were allotted thirteen towns out of the tribes of Issachar, Asher, Naphtali, and Manasseh in Bashan.”
As opposed to Joshua, chapter 21, there is no explicit name of any of these 13 towns. Gershon was the first born of Levi, but somehow seems to be in 2nd place in the distribution of territory. His descendents got 13 towns in the northern part of Israel from Issachar, Asher, Naphtali, and Manasseh. Of the 13 towns, 2 were refuge towns, Golan and Kedesh.