Joshua 15:4

and went along to Azmon, and it went out to the river of Egypt: so that the end of the coast is the sea. And these are their south coasts.

Numbers 34:5

And shall fetch a compass from Azmon unto the river of Egypt, and shall go out at the sea.

Joshua 13:3

from Shihor in Egypt unto the borders of Ekron northward, which land was counted to pertain unto the Cananites, even to the five lords of the Philistines: the Gazathites, Ashdothites, Eshkalonites, Gittites, Ekronites, with the Avites,

Genesis 15:18

And that same day the LORD made a covenant with Abram, saying, "Unto thy seed will I give this land, from the river of Egypt, even unto the great river Euphrates:

Exodus 23:31

And I will make thy coasts from the reed sea unto the sea of the Philistines, and from the desert unto the river. I will deliver the inhabiters of the land into thine 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 shall fetch a compass from Azmon unto the river of Egypt, and shall go out at the sea.

River

Joshua 13:3
from Shihor in Egypt unto the borders of Ekron northward, which land was counted to pertain unto the Cananites, even to the five lords of the Philistines: the Gazathites, Ashdothites, Eshkalonites, Gittites, Ekronites, with the Avites,
Exodus 23:31
And I will make thy coasts from the reed sea unto the sea of the Philistines, and from the desert unto the river. I will deliver the inhabiters of the land into thine hand, and thou shalt drive them out before thee.