Luna Lake is a natural body of water that covers approximately 75 acres (0.30 km2) of land. It is located about three miles (5 km) southeast of Alpine, Arizona at the elevation of 7,890 ft (2,400 m).
Luna Lake has the distinction of being part of the San Francisco River, flowing easterly into New Mexico, then south, and west into the Gila River (in Arizona). The headwaters are north of the other main mountain tributary to the Gila, the Blue River of Arizona.