Planet (Castrovalva)

According to the TARDIS information system, Andromeda was "the planet that form[ed] the Andromedan Phylox Series". Its "central habitation" was Castrovalva. Nyssa told the newly-regenerated Fifth Doctor that it was "a small planet".

Unlike its main city, Andromeda was real. When Castrovalva, a block transfer creation of, ceased to exist, Andromeda persisted.

The planet had running water and dense foliage. It resembled forests seen on Earth and Tara. (TV: Castrovalva)