Las Cruces is a city in Doña Ana County, New Mexico, United States. As of the 2000 census, the city had a total population of 74,267. The population was 86,268 as of the 2006 census estimate, making it the second largest city in the state. Las Cruces is the center of an agricultural region irrigated by the Rio Grande, which flows just west of the city. The city of Las Cruces bisects the fertile Mesilla Valley, the flood plain of the Rio Grande which extends from Hatch, New Mexico to the west side of El Paso, Texas. Las Cruces is also the home of New Mexico State University. NMSU is New Mexico's only land grant university, citing more than 23,000 graduate and undergraduate students on the main campus and four branch campuses. The Organ Mountains are to the east of the city. Las Cruces has a council-manager form of government. It is the county seat of Doña Ana County.Las Cruces is home to the annual Whole Enchilada Fiesta. The fiesta's main attraction is the creation of a very large (on average 10 feet in diameter) flat red enchilada by local restaurant owner Roberto Estrada. The fiesta offers live music, rides, food vendors, and other attractions typical of fairs. The fiesta's mascot, "Twefie" (taken from the abbreviation of the fiesta's name) is a large red chile pepper wearing a sombrero. At the 2004 event, Guinness World Records confirmed that Estrada had made the world's largest flat enchilada. (There was a pre-existing record for world's longest rolled enchilada, but not for world's largest flat enchilada.)In honor of the chile crop of New Mexico, the state has adopted "Red or Green" as its official state question to specify which type of chile is more spicy that season. The Southern New Mexico State Fair is usually held only a few days after the end of the Whole Enchilada Fiesta.