Joshua 15:4

and it passed along to Azmon, and went out at the brook of Egypt; and the goings out of the border were at the sea: this shall be your south border.

Numbers 34:5

and the border shall turn about from Azmon unto the brook of Egypt, and the goings out thereof shall be at the sea.

Joshua 13:3

from the Shihor, which is before Egypt, even unto the border of Ekron northward, which is reckoned to the Canaanites; the five lords of the Philistines; the Gazites, and the Ashdodites, the Ashkelonites, the Gittites, and the Ekronites; also the Avvim,

Genesis 15:18

In that day Jehovah made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates:

Exodus 23:31

And I will set thy border from the Red Sea even unto the sea of the Philistines, and from the wilderness unto the River: for I will deliver the inhabitants of the land into your hand: and thou shalt drive them out before thee.

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
and the border shall turn about from Azmon unto the brook of Egypt, and the goings out thereof shall be at the sea.

River

Joshua 13:3
from the Shihor, which is before Egypt, even unto the border of Ekron northward, which is reckoned to the Canaanites; the five lords of the Philistines; the Gazites, and the Ashdodites, the Ashkelonites, the Gittites, and the Ekronites; also the Avvim,
Exodus 23:31
And I will set thy border from the Red Sea even unto the sea of the Philistines, and from the wilderness unto the River: for I will deliver the inhabitants of the land into your hand: and thou shalt drive them out before thee.

American Standard Version Public Domain