The Xanthan planet was an inhabited planet located inside the Delphic Expanse. It was home to a gigantic floating trading bazaar where shopkeepers such as B'Rat Ud and Zjod made their homes. One of the planet's native animals was the Xanthan marmot. The Xanthan planet was about two days travel from Oran'taku with a warp 5 engine.
In September of 2153, Enterprise NX-01 visited the Xanthan planet to do business with B'Rat Ud. While there, Captain Jonathan Archer helped one of Zjod's slaves, Rajiin, to escape. Rajiin had actually been planted in Zjod's shop by the Xindi a few days earlier. (ENT: "Rajiin")
From orbit, no significant land masses were seen. In the final draft script of "Rajiin", the Xanthan planet was described thus; "Its surface is entirely covered with an unbroken purple ocean, no land masses at all. Dramatic bands of purple clouds streak the atmosphere."