The north and the south, thou hast created them - All that there is in the north and in the south - in the northern and the southern sky - the constellations and the stars; and all that there is in the earth - in the regions of cold and of heat - far as they extend in either direction. The word rendered "north" here - צפון tsâphôn - means properly that which is hidden or dark, and was applied to the north, because the ancients regarded it as the seat of gloom and darkness. Hom. Od., ix. 25. The south, on the other hand, was regarded by them as illuminated and made bright by the beams of the sun. The word rendered "south" - ימין yâmı̂yn - means literally the right hand, and was applied to the south because the ancient geographers were supposed to face the east, as now they are supposed to face the north. Compare the notes at Job 23:9.
Tabor and Hermon - That is, the west and the east - the former of these mountains being on the western side of Palestine, the other on the eastern, and both of them being objects of beauty and grandeur. The idea is, that God had control of all parts of the universe; that the world in every direction, and in every part, declared his power, and made known his greatness.
Shall rejoice in thy name - Or, do rejoice in thee. That is, They, as it were, exult in thee as their God. They are clothed with beauty, as if full of joy; and they acknowledge that all this comes from thee as the great Creator. Compare Psalm 65:8, Psalm 65:12; Psalm 96:11-12.

The north and the south - It is generally supposed that by these four terms all the four quarters of the globe are intended. Tabor, a mountain of Galilee, was on the west of Mount Hermon, which was beyond Jordan, to the east of the source of that river.

The north and the south thou hast created them: (k) Tabor and Hermon shall rejoice in thy name.
(k) Tabor is a mountain west from Jerusalem, and Hermon to the East, so the prophet signifies that all parts and places of the world will obey God's power for the deliverance of his Church.

The two extreme parts of the world, the northern and southern poles, whether inhabited or uninhabited, are created by the Lord, to answer some purpose or another; see Job 26:7.
Tabor and Hermon shall rejoice in thy name; Tabor was a mountain in the western part of Galilee, in the tribe of Zebulun, Joshua 19:12. This mountain, according to Mr. Maundrell (a), stands by itself in the plain of Esdraelon, about 1200 to 1800 yards within the plain; it has a plain area at top, most fertile and delicious, of an oval figure, extended about six hundred yards in breadth, and twice that in length; this area is enclosed with trees on all parts, except towards the south, in which there are in several places cisterns of good water. It is generally thought to be the mountain Christ was transfigured upon before his disciples; and if so, it might then be said to rejoice in his name, when he appeared in so glorious a form upon it; Moses and Elias talking with him, and a voice from the excellent Glory declaring him his beloved Son; and especially the disciples rejoiced in his name there and then, who could say, It is good for us to be here, Matthew 17:1. Hermon was a mountain called by the Sidonians Sirion, and by the Amorites Shenir, Deuteronomy 3:8 and was in the east; and so Mr. Maundrell (b), speaking of Tabor, says, not many miles eastward you see Mount Hermon, at the foot of which is seated Nain, famous for our Lord's raising the widow's son there, Luke 7:11, there was an Hermon near Mount Tabor, thought likely to be here meant; but, be these mountains where and what they may, they were no doubt very high and fruitful ones, clothed with fruitful trees and grass, and covered with flocks; which made the proprietors and all the beholders rejoice in the goodness, wisdom, and power of God: the Targum in the king's Bible gives the four quarters very truly,
"the desert of the north, and the inhabitants of the south, thou hast created; Tabor on the west, and Hermon on the east, praise in thy name.''
(a) Journey from Aleppo to Jerusalem, p. 113, 114, Ed. 7. (b) Journey from Aleppo to Jerusalem, p. 115, Ed. 7.

rejoice in thy name--praise Thy perfections by their very existence.

Tabor - The several parts of the land of Canaan, both within Jordan, where mount Tabor is; and without it, where Hermon lies. Rejoice - Shall be fruitful and prosperous, and so give their inhabitants cause to rejoice. In - By thy favour.