Avalon (The Shadows of Avalon)

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You may be looking for the planet Avalon.

Avalon, otherwise named the Land of Dreams, was an alternate dimension created by Gallifreyan Interventionists. It existed in the unconscious mind of King Constantine, whose dreaming gave it substance. It was made for the Catuvelauni, a Celtic tribe, to escape Roman invaders. Avalon occupied the same space as England in its other dimension and was the same size as Great Britain.

The land was ruled by the Queen Regent, Mab and guarded by Unseelie War Mages. Also living in Avalon were dragons created by magic and the Fair Folk, Silurians who were unintentionally brought along with the Catuveluani.

The TARDIS hit a weak spot in 2012 between Avalon and England, causing its apparent destruction. The collision opened a rift between the dimensions, temporarily stranding the Eighth Doctor in Avalon and causing a military conflict to break out between Queen Mab`s court and British UNIT forces. After the realm was saved and before the rift was closed, Compassion completed her transformation into a TARDIS in Avalon. (PROSE: The Shadows of Avalon)

Ancelyn and Winifred Bambera once went on a holiday to in Avalon. (PROSE: Faithful Friends: Part 3)