Clark Colony was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, near the Romulan Neutral Zone. It was designed as a stopping point for Starfleet personnel going to the outposts, and thereafter became a shore leave stop for that personnel. According to a Starfleet Academy simulator scenario, it was the place where the Starfleet engaged the Romulan Phoenix heavy cruiser. (TOS video game: Starfleet Academy Starship Bridge Simulator)