Joshua 15:4

It continued to Azmon and proceeded to the brook of Egypt, and the border ended at the sea. This shall be your south border.

Numbers 34:5

The border shall turn direction from Azmon to the brook of Egypt, and its termination shall be at the sea.

Joshua 13:3

from the Shihor which is east of Egypt, even as far as the border of Ekron to the north (it is counted as Canaanite); the five lords of the Philistines: the Gazite, the Ashdodite, the Ashkelonite, the Gittite, the Ekronite; and the Avvite

Genesis 15:18

On that day the Lord made a covenant with Abram, saying,
To your descendants I have given this land,
From the river of Egypt as far as the great river, the river Euphrates:

Exodus 23:31

I will fix your boundary from the Red Sea to the sea of the Philistines, and from the wilderness to the River Euphrates; for I will deliver the inhabitants of the land into your hand, and you will drive them out before you.

Treasury of Scripture Knowledge

Summary

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.

Azmon

Bible References

Azmon

Numbers 34:5
The border shall turn direction from Azmon to the brook of Egypt, and its termination shall be at the sea.

River

Joshua 13:3
from the Shihor which is east of Egypt, even as far as the border of Ekron to the north (it is counted as Canaanite); the five lords of the Philistines: the Gazite, the Ashdodite, the Ashkelonite, the Gittite, the Ekronite; and the Avvite
Exodus 23:31
I will fix your boundary from the Red Sea to the sea of the Philistines, and from the wilderness to the River Euphrates; for I will deliver the inhabitants of the land into your hand, and you will drive them out before you.