The extent of Israel's country, great as it was, was nothing compared to the extent of GOD'S love for them. The boundaries here mentioned, if spiritually considered, have a delightful reference to what the apostle observes of the boundless love of GOD in CHRIST. Ephesians 3:18-19.
Deuteronomy 11:22-25
22 For if ye shall diligently keep all these commandments which I command you, to do them, to love the LORD your God, to walk in all his ways, and to cleave unto him;
23 Then will the LORD drive out all these nations from before you, and ye shall possess greater nations and mightier than yourselves.
24 Every place whereon the soles of your feet shall tread shall be yours: from the wilderness and Lebanon, from the river, the river Euphrates, even unto the uttermost sea shall your coast be.
25 There shall no man be able to stand before you: for the LORD your God shall lay the fear of you and the dread of you upon all the land that ye shall tread upon, as he hath said unto you.