Anderson Mesa (Navajo: Hosh Dikʼání) is an approximately 5-long-mesa located at 35°03′18″N 111°26′24″W / 35.05500°N 111.44000°W, 20 miles southeast of Flagstaff, Arizona, east of Lake Mary and north of Mormon Lake, in Coconino County. This mesa landform, with an elevation between 6,200 and 7,200 feet (1,900 and 2,200 m), has been the site of Lowell Observatory's Anderson Mesa Station since 1959. Because it is also very flat, it is also home to the Naval Observatory's Navy Precision Optical Interferometer, or "NPOI", since 1992.