Read Joshua 15:4 Using Other Translations
From thence it passed toward Azmon, and went out unto the river of Egypt; and the goings out of that coast were at the sea: this shall be your south coast.
passes along to Azmon, goes out by the Brook of Egypt, and comes to its end at the sea. This shall be your south boundary.
From there it passed to Azmon until it finally reached the Brook of Egypt, which it followed to the Mediterranean Sea. This was their southern boundary.