Sunset over the Escudilla mountains reflects in Luna lake near Alpine, Arizona. 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. Luna Lake is a 75-acre (300,000 m2) impoundment of the upper San Francisco River. It has a maximum depth of 21 feet (6.4 m) and an average depth of 8 feet (2.4 m). It is stocked annually with fingerling and subcatchable rainbow and cutthroat trout. Because it is a shallow, nutrient-rich lake, it is subject to water quality problems and excessive weed growth.