- For other uses, see Arcadia.
- Vellun Gamma system
Arcadia is a temperate world whose thin atmosphere contains slightly more oxygen than Earth's. The planet is primarily made up of water with islands dotting the surface and two small continents lying near the southern pole. Several artificial islands have been constructed that can be moved about as the seasons change.
The only non-intelligent organism observed to exist on Arcadia by Federation scientists thus far is a type of plankton abundant in the planet's oceans.