The desolate valleys... — The Hebrew adjective has rather the meaning of precipitous or steeply walled, and the noun that of torrent valley, like the Arabic wady. The whole verse is a graphic description of the characteristic features of the scenery of Judah.
Related Commentaries of Isaiah 7:19
Isaiah 7:19
19 And they shall come, and shall rest all of them in the desolate valleys, and in the holes of the rocks, and upon all thorns, and upon all bushes.e