So, which was it?
(33) In the valley—i.e., the Shephêlah, or plain of the coast. Of the fourteen that follow in Joshua 15:33-36, Conder identifies ten. Eshtaol, and Zoreah, were afterwards assigned to Dan (Joshua 19:41).
With the exception of Zorah and Eshtaol, border towns to the tribe of Dan (Joshua 19:41; Judges 13:25), famous in the history of Samson (see Judges 13-16.)
Keil and Delitzsch:
The most northerly part of this district was given up to the tribe of Dan on the second division