Joshua 15:4

{it passes on} to Azmon, continues by the wadi of Egypt, and {it ends} at the sea. This will be your southern border.

Numbers 34:5

The boundary will turn from Azmon to the valley of Egypt, and its limits will be to the sea.

Joshua 13:3

from the Shihor, which [is] {east of Egypt}, up to the border of Ekron to [the] north, which is reckoned as Canaanite; [there are] five Philistine rulers: the Gazites, Ashdodites, Ashkelonites, Gittites, Ekronites, and the Avvim.

Genesis 15:18

On that day Yahweh {made} a covenant with Abram saying, "To your offspring I will give this land, from the river of Egypt to the great river, the Euphrates river,

Exodus 23:31

" 'And I will set your boundary from the {Red Sea} and up to the sea of the Philistines and from [the] desert up to the river, because I will give the inhabitants of the land into your hand, and you will drive them out from 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 boundary will turn from Azmon to the valley of Egypt, and its limits will be to the sea.

River

Joshua 13:3
from the Shihor, which [is] {east of Egypt}, up to the border of Ekron to [the] north, which is reckoned as Canaanite; [there are] five Philistine rulers: the Gazites, Ashdodites, Ashkelonites, Gittites, Ekronites, and the Avvim.
Exodus 23:31
" 'And I will set your boundary from the {Red Sea} and up to the sea of the Philistines and from [the] desert up to the river, because I will give the inhabitants of the land into your hand, and you will drive them out from before you.