What does Joshua 15:47 mean?

From Ekron to the sea, all the towns near Ashdod, with their villages, and Ashdod itself with its villages, as far as Gaza and its villages, all the way to the border of Egypt and the coastline of the Mediterranean Sea. Joshua 15:47 - Modern Text Bible

(This verse describes the far western edge of Judah's territory, reaching the Mediterranean and bordering Egypt. It includes major cities and all their surrounding settlements.)