P3X-403 was an Unas populated planet in the Milky Way galaxy, which held a Stargate and had huge resources of Naquadah. The planet's magnetic field possessed particular properties that limited the use of compasses and radios. The planet's surface was covered mostly in forests. The Goa'uld brought the Unas there to mine the naquadah, but the Unas rebelled against them and the mines thus became a sacred place to the Unas. Stargate Command garnered a treaty with the Unas which included that the Unas would receive food and supplies if they extracted the naquadah for the Tau'ri. Considering the presence of Serpent Guard helmets on a memorial showing the instruments of Goa'uld torture, the planet may have originally belonged to Apophis. (SG1: "Enemy Mine")

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