Borella
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Borella is the name of the planet from which the Borellian Nomen Bora, Maga, and Taba originate. It is mentioned briefly in the episode "Baltar's Escape" when Baltar mentions something he obtained for the Nomen. Baltar admits that the Borellian desert layers he saved for the Nomen were not actually from Borella but were the closest thing available from the livestock ship.
The Nomen describe Borella as "the land of the mega sun and the endless sands" (TOS: "The Man with Nine Lives").