In high places; upon the mountains, where by the course of nature there are no rivers. In the midst of the valleys; or, in the valleys, to wit, in such of them as are not well watered. I will make the wilderness a pool of water, and the dry land springs of water: these people, who are like a dry and barren wilderness, I will abundantly water with my blessing, and make them fruitful and beautiful, as the next verse showeth; which may be understood, either of the Jews, who were in a wilderness condition, till God brought them out of it; or of the Gentiles converted to the true religion under the gospel.
Related Commentaries of Isaiah 41:18
Isaiah 41:18
18 I will open rivers in high places, and fountains in the midst of the valleys: I will make the wilderness a pool of water, and the dry land springs of water.