I am grounding this first in the boundary texts and then mapping the named borders into current geography. The main issue is not whether a promise exists, but how to identify “the river of Egypt” and whether Genesis 15 gives the maximal covenant border or the normal lived inheritance border.

The textual hinge is this: Genesis 15 gives the broad covenant grant, while Numbers 34 gives the narrower allotment lines for tribal distribution in Canaan. So the answer is not one flat sentence. Scripture itself presents a maximal covenant border and a more specific administrative border.

[Partly unverified: the biblical border texts are clear, but a few northern place identifications such as Mount Hor, Ziphron, and Hazar-enan are probable rather than certain.]

Summary

1. Abraham, Isaac, and Jacob are promised the same land, not three different lands. Genesis 28:13 localizes the promise at Bethel, but Genesis 35:12 explicitly says Jacob receives “the land” already given to Abraham and Isaac. Genesis 15:18 gives the broad covenant border, and Genesis 17:8 defines that inheritance as “all the land of Canaan.”

2. Scripture presents two concentric land descriptions. The broader Abrahamic grant runs from “the river of Egypt” to the Euphrates, and from the southern wilderness region up to Lebanon and the Hamath approach. The narrower Numbers 34 map is the specific land of Canaan to be apportioned west of the Jordan, with Transjordan handled separately.

3. The best current geographical identification for the southwest border is not the Nile but the Wadi el-Arish in northern Sinai, near modern al-Arish. That is because later border texts regularly use the “brook/stream of Egypt” language for the southwestern boundary, and Wadi el-Arish is a seasonal watercourse emptying into the Mediterranean near al-Arish. The Euphrates is the well known river running through modern Turkey, Syria, and Iraq, so the eastern limit reaches to the Euphrates corridor in modern Syria.

4. In today’s place names, the broadest promise most naturally includes modern Israel, the West Bank, Gaza, northern Sinai up to the Wadi el-Arish, much or all of Jordan, much of Lebanon, and a significant belt of southwestern and central Syria up to the Euphrates. The narrower Numbers 34 “Canaan” map is mainly the land west of the Jordan, extending north into Lebanon and northeast toward the Syria frontier, but not all the way east to the Euphrates.

Exegesis

Genesis 15:18 in the Masoretic Text reads: “min-nehar mitsrayim ad-ha-nahar ha-gadol nehar perath” [from the river of Egypt to the great river, the river Euphrates]. Key terms are nahar [river] and Perath [Euphrates]. The construction min … ad [from … to] marks an outer territorial span, not a mere travel route. The Septuagint preserves the same sense with “apo tou potamou Aigyptou heos tou potamou tou megalou, potamou Euphratou” [from the river of Egypt to the great river, the Euphrates river]. There is no major textual variant here that changes the geography.

Genesis 17:8 then identifies the inheritance as “all the land of Canaan,” and Genesis 35:12 explicitly transfers that same land to Jacob. Genesis 28:13 does not mean Jacob only receives the few square meters under his body at Bethel. In context, “the land on which you lie” is a local reaffirmation of the already established patriarchal land promise, and Genesis 35:12 removes any doubt by restating the same inheritance formula given to Abraham and Isaac.

The crucial lexical distinction is this. Genesis 15:18 uses nahar mitsrayim [river of Egypt], while Numbers 34:5 uses the root n-h-l in “nahal/nahalah mitsrayim” [brook, wadi, torrent-bed of Egypt]. That difference is why some Jewish interpreters took Genesis 15 toward the Nile reading. A traditional Jewish line, seen for example in Rashi on Joshua 13:3, identifies the Egyptian border river with the Nile. But the recurring border formula in Numbers, Joshua, Kings, and Isaiah fits the Wadi el-Arish frontier better than the Nile delta.

The boundary sets in Scripture

The broad Abrahamic or covenant boundary is given across several texts. Genesis 15:18 gives southwest to northeast: river of Egypt to Euphrates. Deuteronomy 11:24 and Joshua 1:4 add south to north and west to east: from the wilderness to Lebanon, and from the Euphrates to the western sea [Mediterranean]. Exodus 23:31 gives the same land in another frame: from the Red Sea to the Sea of the Philistines, and from the wilderness to the River. Read together, these texts describe the maximum covenant grant.

The narrower Numbers 34 description is explicitly “the land of Canaan with its borders.” Its south line runs from the wilderness of Zin along Edom, through the region of Kadesh-barnea, to Azmon, then to the Brook of Egypt and the Mediterranean. Its west side is the Great Sea. Its north line runs from the Mediterranean toward Mount Hor, Lebo-hamath, Zedad, Ziphron, and Hazar-enan. Its east line then drops from Hazar-enan by Shepham and Riblah to the east side of the Sea of Kinnereth [Sea of Galilee], then down the Jordan to the Salt Sea [Dead Sea]. That is not the same as saying the tribal allotment border itself ran along the Euphrates.

What that means by today’s place names

If one asks for the most defensible modern rendering of the broad promise, the southwest marker is most likely Wadi el-Arish near modern al-Arish in North Sinai, Egypt. The western edge is the Mediterranean coast. The northern edge reaches through Lebanon toward the Hamath approach, with Lebo-hamath commonly identified around modern Labwa in the northern Beqaa Valley of Lebanon. Zedad is probably Sadad in Syria. Hazar-enan is often placed near al-Qaryatayn in Syria, though that last identification is not certain. Riblah is usually identified with modern Ribleh in Syria. Kadesh-barnea is commonly associated with the Ain el-Qudeirat oasis area in northeastern Sinai.

So, in present-day terms, the maximal Abrahamic grant most plausibly covers: all of modern Israel; the Palestinian territories of the West Bank and Gaza; the northern Sinai border zone up to Wadi el-Arish; most or all of modern Jordan; much of modern Lebanon; and a substantial part of southwestern and central Syria reaching to the Euphrates corridor. The text itself names rivers, seas, deserts, and approach-cities, not modern nation-states, so this is an approximate modern mapping, not a Scripture-given nation-state polygon.

Historically, the Old Testament says Israel came closest to this wider extent under David and Solomon. Solomon is described as ruling “from the Euphrates … to the border of Egypt,” and the celebratory formula “from Lebo-hamath to the Brook of Egypt” shows the standard north-south frame. But that is political dominion and tribute language, not proof that every inch was fully settled tribally in the Numbers 34 sense.

Theological analysis

From a conservative dispensational reading, the land promise is literal, territorial, and multigenerational. Jacob does not replace Abraham’s land promise with a merely spiritual promise; he inherits the same one. The logic is: Genesis 15 gives the covenant border, Genesis 17 names it as Canaan, Genesis 28 localizes it to Jacob, Genesis 35 explicitly transfers the same land to Jacob, and Numbers 34 gives the concrete Canaan allotment within that larger covenant framework. The promise is therefore not reducible to a symbol, even though it also has typological and redemptive significance.

On the metaphysical [reality-structure] level, the land is not random acreage. It is the divinely marked stage on which seed, kingdom, worship, inheritance, holiness, and judgment become historical and visible. In biblical ontology [what the thing really is], the land is covenant-space: geography ordered by God’s oath. On the psychological-spiritual level, that means Israel’s relation to the land is never merely cartographic. The grant is from God, but the enjoyment of it is tied to covenant fidelity. That is why Scripture can speak both of an irrevocable patriarchal gift and of temporal exile for disobedience without contradiction.

Bottom line

Precisely stated: God promised Abraham, Isaac, and Jacob the same land – “all the land of Canaan” – with a maximal covenant span from the Egyptian frontier, best identified as the Wadi el-Arish though a Nile reading exists in some Jewish tradition, to the Euphrates; from the southern wilderness and Red Sea region up to Lebanon and the Hamath approach; and from the Mediterranean eastward to the Euphrates corridor. In modern place names, that most plausibly means Israel, the West Bank, Gaza, northern Sinai to al-Arish, most or all of Jordan, much of Lebanon, and part of Syria up to the Euphrates. The narrower Numbers 34 map is the land of Canaan for tribal allotment, not the full outer limit of the Abrahamic grant.