The planet in the Delphic Expanse where the Xindi built the weapon intended to destroy Earth.
Azati Prime is the world where the Xindi constructed their superweapon. After tricking Degra in Stratagem, Archer learns its location, and in Azati Prime he plans a suicide mission, flying a captured Xindi craft into the construction facility to destroy the weapon himself.
The attempt fails, and Archer is captured. At the same time the Xindi launch a devastating attack on Enterprise, killing members of the crew and leaving the ship crippled. Azati Prime is the low point of the Xindi mission, and the losses there shadow the episodes that follow.