Numbers 34:6

" 'Your western boundary will be the Great Sea; this will be your western boundary.

Joshua 1:4

From the wilderness {and the Lebanon}, up to the great river, the river Euphrates, all of the land of the Hittites, and up to {the great sea in the west}, will be your territory.

Joshua 9:1

Now when all the kings who [were] beyond the Jordan in the hill country and in the Shephelah, and on all the coast of the great sea toward Lebanon--the Hittites, the Amorites, the Canaanites, the Perizzites, the Hivites, and the Jebusites--heard of [this],

Joshua 15:12

And [the] western border [is] to the Great Sea and its coast. This [is] the border surrounding the descendants of Judah according to their families.

Joshua 15:47

Ashdod, its towns and villages; Gaza, its towns and villages, up to the wadi of Egypt and the Great Sea and its coast.

Joshua 23:4

Look! I have allotted to you these remaining nations as an inheritance for your tribes, from the Jordan, [with] all the nations that I have cut off, to the Great Sea {in the west}.

Ezekiel 47:10

And then fishers from En Gedi and [on] up to En Eglaim will stand beside it, a sea-girt drying yard for nets; their fish for the dragnets will be {of every kind}, like the fish of the great sea, [and] very many.

Ezekiel 47:15

And this [is] the boundary of the land: {On the north side}, from the great sea [by] the way of Hethlon {until you come to Zedad},

Ezekiel 47:20

{And on the west side} the Great Sea [shall be] the boundary up to opposite Lebo-Hamath. {This is the western boundary}.

Treasury of Scripture Knowledge

Summary

And as for the western border, ye shall even have the great sea for a border: this shall be your west border.

Bible References

General references

Joshua 1:4
From the wilderness {and the Lebanon}, up to the great river, the river Euphrates, all of the land of the Hittites, and up to {the great sea in the west}, will be your territory.
Joshua 9:1
Now when all the kings who [were] beyond the Jordan in the hill country and in the Shephelah, and on all the coast of the great sea toward Lebanon--the Hittites, the Amorites, the Canaanites, the Perizzites, the Hivites, and the Jebusites--heard of [this],
Joshua 15:12
And [the] western border [is] to the Great Sea and its coast. This [is] the border surrounding the descendants of Judah according to their families.
Joshua 23:4
Look! I have allotted to you these remaining nations as an inheritance for your tribes, from the Jordan, [with] all the nations that I have cut off, to the Great Sea {in the west}.
Ezekiel 47:10
And then fishers from En Gedi and [on] up to En Eglaim will stand beside it, a sea-girt drying yard for nets; their fish for the dragnets will be {of every kind}, like the fish of the great sea, [and] very many.