Rubicun III

From Memory Alpha, the free Star Trek reference.

Rubicun III is the homeworld of the Edo species. The USS Enterprise-D visited this planet after delivering Earth colonists to the neighboring Strnad system. The Edo were protected by a transdimensional being who they worshiped as their God. Random punishment zones were moved around on the planet's surface. (TNG: "Justice")

The surface of Rubicun III was shot at the Van Nuys Japanese garden at the Tillman Water Reclamation Plant, California. The Starfleet Academy and Starfleet Headquarters scenes were also filmed at this location.

Judging from the scenery, Rubicun III is probably M-class. "Edo" was an early name of Tokyo, Japan, although it is not known whether the location of the shooting affected the naming of the Edo species.