«لَهُمْ فِيهَا دَارُ الْخُلْدِ»
For them, within it, is the abode of permanence.
This is part of Qurʾan 41:28. The expression imagines an “abode of permanence” within the place of punishment. On the rhetorical analysis of tajrid, fiha creates the effect of a specially distinguished abode within it, reinforcing permanence and severity.
The rhetorical purpose is not to supply a physical map but to intensify the sense of unending punishment.