Thalos VII was the inhabited seventh planet in the Thalos system of the Alpha Quadrant.
Sometime in 2364 or 2365, the Federation starship USS Enterprise-D visited this planet. During the visit, Wesley Crusher had his first experience with the Thalian chocolate mousse. This mousse was a local delicacy made from cocoa beans aged for four centuries. For Crusher, visiting worlds like Thalos VII was the best part about being on the Enterprise-D. This world was one of his favorite places. (TNG: "The Dauphin")
This planet was only mentioned in dialogue.
This planet's quadrant of origin is inferred based on the position of its star system as seen in the star chart appearing in the Star Trek: Picard episode "Maps and Legends".