Cardassia Prime (or simply Cardassia) was the inhabited second and prime planet in the Cardassian system, located in the Alpha Quadrant. The planet had one moon. Cardassia Prime was the capital world of the Cardassian Union and the homeworld of the Cardassians, a warp-capable humanoid species. For two years, from 2373-2375, Cardassia Prime was an ally of the Dominion.