Joshua 15:4
It proceeded to Azmon, joined the Brook of Egypt, and ended at the Sea. This was their southern border.
Berean Standard Bible
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.
and it passed along to Azmon, went out at the brook of Egypt; and the border ended at the sea. This shall be your south border.