Heliopolis

Heliopolis was a plane where the deities of the Mulhorandi pantheon resided.

Great Wheel cosmology
In the Great Wheel cosmology, Heliopolis was more specifically the name of a joint realm of three Mulhorandi deities in Arcadia's second layer of Buxenus. It was comprised of Thekele-Re, ruled by Horus-Re, Gizekhtet by Isis, and Memphiria, governed by Osiris.