Obverse

The Obverse was a mysterious region of the universe in which Time and Space were not only not one, but never had been and never would be. Iris Wildthyme came from there. (PROSE: The Blue Angel, Wildthyme Beyond!)

Mathara believed that the Obverse was "a temporal boil on the flesh of the cosmos" created after the timelines were twisted by the Third Doctor getting infected with the Faction Paradox biodata virus. (PROSE: The Ancestor Cell) One implied that the Enclave into the Obverse was a construction of the Celestis' making. (PROSE: The Taking of Planet 5)

Geography
The Obverse was connected to N-Space by the Enclave. Another entrance to the Obverse was located through a Ringpull on Hyspero. The Clockworks and its capitol of Saga City were in the Obverse. (PROSE: Wildthyme Beyond!)

History
Valceans originated from the Obverse. (PROSE: Verdigris)

Iris Wildthyme once encountered the Eighth Doctor in the Obverse. (PROSE: The Blue Angel)