"With a nation, naval, I shall anger them": These are the heretics, viz. (Psalms 14:1) "The naval says in his heart: 'There is no G-d.'"
(Devarim, Ibid. 22) "For a fire has been kindled in My wrath": When punishment emerges from the world, it does so only through wrath. Whence is it derived (that it descends) even into Gehinnom? From "and it shall burn to the nethermost pit."
"and it shall consume the land and its produce": Eretz Yisrael. "and it shall set ablaze the foundations of the mountains": Jerusalem, as it is written (Psalms 125:2) "Jerusalem — mountains surround it, and the L-rd surrounds His people."