The geographic borders of the Promised Land are described many times in the Torah, sometimes in general terms and sometimes in greater detail. In Bereishit we are told:

See also Bamidbar 34:1-12 and Devarim 1:7.
These descriptions are the "ideal" or perhaps the potential borders of Israel. Already in the days of Joshua we learned to accept the geo-political realities as well as the spiritual condition of the people, and to live within the real borders that these factors made possible.
However, the borders of the Promised Land were always open ended, just as the possession of the land itself was conditional. While in some directions the borders seemed fixed by nature, in other directions they remained undetermined.

here is a suggestion here of unlimited expansion. Indeed the request of the two and half tribes to settle on the east bank of the Jordan was granted even though that had never been part of the original plan of the land of Canaan.
Wherever the borders will ultimately be drawn, they will reflect "wherever the sole of your feet shall tread," that is to say, wherever our people have walked, lived and settled. Claims to a land cannot be based solely on Divine promises or historical documents. The promise of the land will be fulfilled when our people seize every opportunity to return and build a national life as we are doing today.
We read in Tehilim

Jerusalem will be rebuilt only when the people of Israel yearn for it to such an extent that they embrace her stones and dust. And Jerusalem will remain ours only as long as our people’s love for the land leads to Aliyah. Every Jewish family must have at least one of its members living in Israel!

Tel: 972-2-566-7787 ext. 254 - Fax: 972-2-561-7432
email: [email protected]