'Edom' or 'Idumea,' as in Isaiah 34:5, signifies people who are in evil and falsities derived there.

(Референци: The Inner Meaning of the Prophets and Psalms 34)

584. There are hells everywhere. They are under the mountains and hills and cliffs and under the plains and valleys. The openings or gates to the hells that are under the mountains and hills and cliffs look at first sight like crevices or fissures in the rocks. Some of them are quite broad and open, some narrow and confined, full of rough places. All of them seem dim and gloomy when you look in, although the hellish spirits who live there have the kind of illumination you get from glowing coals. Their eyes are adjusted to the reception of this kind of light. This is because when they were living in the world they were in darkness about divine truths owing to their denial of them. They were in a kind of light as to their false convictions because they affirmed them, which gave their eyesight the form it has. This is also why heaven's light is darkness to them, so when they come out of their caves, they cannot see anything. This makes it abundantly clear that we come into heaven's light to the extent that we have acknowledged the Divine and affirmed within ourselves the values of heaven and the church. We come into the darkness of hell to the extent that we have denied the Divine and affirmed within ourselves values contrary to those of heaven and the church.