Carosi XII was girdled by the vast Eurae Mountains, with most of its remaining surface dominated by plains and large glaciers. The Avuae Sea was the planet's only large body of water, and served as a social and cultural nexus for the Carosites. The Avuae's high mineral content prevented the sea from freezing over, and the water was considered refreshing by Carosites and other beings who could tolerate its bracing cold.
Continuing volcanic activity on Carosi XII led to the formation of the planet's most popular tourist destination, the hot springs near Newlife Point, which had natural healing properties. Visitors could get from Newlife Point to the crystalline cave that contained the hot springs via either an underground rail system or pleasure boat.
Astronomers correctly predicted the expansion of the star Carosi into a red giant, so prior to this cataclysm, terraforming efforts were begun on Carosi XII. The effort proved fruitful, and after their original homeworld was swallowed up by Carosi, the Carosites relocated to the twelfth planet (which was now the seventh planet, but maintained its original nomenclature).
During the Galactic Civil War, Polo Se'lab commanded Rebel forces on the planet, and Sayer Mon Neela was the base's tactician. Later, Carosite leader Omo Taj permitted the New Republic to construct a New Republic outpost on the side of a mountain near the Avuae's north shore. This outpost was commanded by Balderik Rajana.
Carosi XII is said to have only one moon in Planets of the Galaxy, Volume Two and in its reprint, The Star Wars Planets Collection. However, in the novel Planet of Twilight, a reference is made to the existence of a factory on Carosi's larger moon, implying more than one moon. No canonical explanation for this discrepancy has yet been given.
- Planets of the Galaxy, Volume Two
- The Star Wars Planets Collection
- Alliance Intelligence Reports
- Heroes & Rogues
- "Cracken's Rebel Operatives" — Star Wars Adventure Journal 10
- Alien Encounters
- The Essential Guide to Droids
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- The Essential Reader's Companion