Lebanon, Carmel and Sharon, most of whom, you will remember, were supposed to be annihilated in the last chapter, are now going to blossom. God is going to come along and make deaf people hear, blind people see, lame people walk and dumb people speak which, since he invented all those things, seems only fair.
He's going to do some city beautification as well, making pools in dry areas and parks in areas currently inhabited by dragons. Then he'll build a highway that the unclean shall not pass over (v. 8) nor will lions and ravenous beasts be allowed to use it, only righteous people will use it to come home to Zion. Which is why libertarians have always been ridiculous to me.
Now we're back in 2 Kings and 2 Chronicles because this book is not so much divinely inspired as badly copied. Specifically, we're reliving 2 Kings 18-20 and 2 Chronicles 32, neither of which was what you might call scintillating, so I'm not going to summarise them again a third time. Jerry Falwell of course, claims that these chapters are clear evidence of the fulfillment of the prophet's predictions about the Assyrian takeover of Israel.