What sets Vaikuntha apart from most realms in this collection is not simply that it has never been mapped, but that Vaishnava commentators state directly, in their own doctrinal language, that mapping it would be a category error. Bhagavad Gita 15.6 describes Vishnu's supreme abode as needing no illumination from sun, moon or fire — a statement Vaishnava acharyas read as pointing to a self-luminous reality standing entirely outside physical description, not a distant but locatable place merely too bright to see.
Where Puranic texts do assign Vaikuntha a cosmological "address" — placed, in the Bhagavata Purana, some 26,200,000 yojanas above Satyaloka, in the direction associated with Capricorn — Vaishnava philosophy treats these figures as devotional and symbolic scaffolding rather than literal coordinates, a way of gesturing at transcendence using the only vocabulary ordinary language has.