“daughter-towns.” The Hebrew text is just “daughters,” referring to small close-by towns that are supported by a “mother” town, a large and normally well-fortified town (see commentary on Josh. 15:45).

“the third city is Napheth.” The town of Dor is also called Napheth-dor (cp. Josh. 11:2; 12:23). Another possibility is that Napheth refers to “three heights,” but that would be very obscure because there does not seem to be heights related to the last three cities in the list.