Dimensions

Verse 4 defines the boundaries of the land: "From the wilderness and this Lebanon even unto the great river, the riper Euphrates, all the land of the Hittites, and unto the great sea toward the going down of the sun, shall be your coast." This has been interpreted as follows: from the Great Desert in the south (Egypt), to the Great Mountains of the north (Lebanon), from the Great River in the east (Euphrates), to the Great Sea in the West (the Mediterranean). From the standpoint of the children of Israel standing at Jordan's bank, this entire territory was occupied by enemies. For us as believers, we see the entire world as the domain of Satan and his followers.
The boundaries have typical meaning for us. The desert suggests the fact that the world cannot give us any sustenance; it is dry and devoid of necessary food. Only the Lord can provide what the believer needs day by day.
The mountains suggest the power of the world, over which the believer, in his own strength, cannot triumph. But we know that Christ has overcome the world.
The river suggests the prosperity of the world. In an otherwise arid land, a great river provides the water necessary to produce crops and sustain life. We believers are naturally attracted by the world's perceived prosperity, but we know it will not last. The only real prosperity for believers is spiritual, the result of obedience to the Word of God and reliance upon the Lord Jesus all the time.
The sea to the west suggests the restlessness of the world. Man, in his natural state, proves to himself over and over again that he is never satisfied with what he has. As a result of the work of Christ for us (typified by crossing the Red Sea) we have peace with God. As a result of the work of Christ in us (typified by crossing the Jordan and living in the promises), we have the peace of God which passes all understanding.