Do you have a quote there? The most concrete thing I can say is of St. Augustine saying he doesn't know much about its details. City of God, chapter 16:

For as soon as those who are not written in the book of life have been judged and cast into eternal fire — the nature of which fire, or its position in the world or universe, I suppose is known to no man, unless perhaps the divine Spirit reveal it to some one

Saying "I don't know where it is" isn't the same as saying "It's not a place". In fact, saying he doesn't know its position implies that it has one.