Taking its name from one of the longest living trees in the Arizona desert, the 129,000-acre Ironwood Forest National Monument is a true Sonoran Desert showcase. Keeping company with the ironwood trees are mesquite, palo verde, creosote, and saguaro, blanketing the monument floor beneath rugged mountain ranges named Silver Bell, Waterman and Sawtooth. In between, desert valleys lay quietly to complete the setting. Elevations here range from 1,800 to more than 4,200 feet. Three areas within the monument, the Los Robles Archeological District, the Mission of Santa Ana del Chiquiburitac and the Cocoraque Butte Archeological District, are listed on the National Register of Historic Places.