12 Towns allotted to Merarites in Reuben, Gad and Zebulun Joshua 21

Joshua 21:7 and 35-40

The descendants of Merari, according to their clans, received twelve towns from the tribes of Reuben, Gad and Zebulun. ... The Merarite clans (the rest of the Levites) were given:

from the tribe of Zebulun, Jokneam,

Kartah, 

Dimnah

and Nahalal, together with their pasturelands - four towns; 

from the tribe of Reuben, Bezer,

Jahaz, 

Kedemoth

and Mephaath, together with their pasturelands - four towns; 

from the tribe of Gad, Ramoth in Gilead (a city of refuge for one accused of murder),

Mahanaim, 

Heshbon

and Jazer, together with their pasturelands - four towns in all. 

The total number of towns allotted to the Merarite clans, who were the rest of the Levites, came to twelve.