כָּל־עָרִ֥ים עֶ֖שֶׂר וּמִגְרְשֵׁיהֶ֑ן לְמִשְׁפְּח֥וֹת בְּנֵֽי־קְהָ֖ת הַנּוֹתָרִֽים׃ (ס)
All the cities of the families of the rest of the children of Kohath were ten with the open land about them.
Read midrashic interpretation of Joshua 21:26: and classical rabbinic exegesis.