Tucson is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second-largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area. Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the United States–Mexico border. Tucson is the 34th-largest city and the 53rd-largest metropolitan area in the United States (2014).
Pima County is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the population is centered. The county is named after the Pima Native Americans who are indigenous to this area.
Scouting in Arizona has a long history, from the 1910s to the present day, serving thousands of youth in programs that suit the environment in which they live.
Ajo is an unincorporated community in Pima County, Arizona, United States. It is the closest community to Organ Pipe Cactus National Monument. The population was 3,304 at the 2010 census. Ajo is located on State Route 85 just 43 miles (69 km) from the Mexican border.
Catalina Foothills is an unincorporated community and census-designated place (CDP) located north of Tucson in Pima County, Arizona, United States. Situated in the southern foothills of the Santa Catalina Mountains, Catalina Foothills had a population of 50,796 at the 2010 census. Catalina Foothills is one of the most affluent communities in Arizona and in the U.S., with the 6th highest per capita income in Arizona, and the 14th highest per capita income in the U.S. of communities with a population of at least 50,000. The Catalina Foothills community includes some of Arizona's most expensive homes and land, and has the highest median property value. It also includes resorts, golf courses, and spas.
Oro Valley, incorporated in 1974, is a suburban town located 6 miles (9.7 km) north of Tucson, Arizona, United States, in Pima County. According to the 2020 census, the population of the town is 47,070, an increase from 29,700 in 2000. Dubbed the "Upscale Tech Mecca" of Southern Arizona by the Arizona Daily Star newspaper, Oro Valley is home to over 10 high tech firms and has a median household income nearly 50% higher than the U.S. median. The town is located approximately 110 miles (180 km) southeast of the state capital of Phoenix.
Southern Arizona is a region of the United States comprising the southernmost portion of the State of Arizona. It sometimes goes by the name Gadsden or Baja Arizona, which means "Lower Arizona" in Spanish.
The Santa Catalina Mountains, commonly referred to as the Catalina Mountains or the Catalinas, are north and northeast of Tucson in Arizona, United States, on Tucson's north perimeter. The mountain range is the most prominent in the Tucson area, with the highest average elevation. The highest point in the Catalinas is Mount Lemmon at an elevation of 9,157 feet (2,791 m) above sea level and receives 18 inches (46 cm) of precipitation annually.
The Tucson Mountains are a minor mountain range west of Tucson, Arizona, United States. The Tucson Mountains, including Wasson Peak, are one of four notable mountain ranges surrounding the Tucson Basin. The Santa Catalina Mountains lie to the northeast, the Rincon Mountains are to the east of Tucson, and the Santa Rita Mountains lie to the south. Additionally, the Sierrita Mountains lie due south, the Roskruge Mountains lie to the west across Avra Valley, the Silver Bell Mountains lie to the northwest, and the Tortolita Mountains lie to the north across the Santa Cruz Valley.
The Rincon Mountains are a significant mountain range east of Tucson, Pima County, Arizona, in the United States. The Rincon Mountains are one of five mountain ranges surrounding the Tucson valley. The other ranges include the most prominent, the Santa Catalina Mountains to the north, the Santa Rita Mountains to the south, the Tucson Mountains to the west, and the Tortolita Mountains to the northwest. Redington Pass separates the Rincon Mountains from the Santa Catalina Mountains. The Rincon Mountains are generally less rugged than the Santa Catalina Mountains and Santa Rita Mountains. The Rincon Mountains are also included in the Madrean sky island mountain ranges of southeast Arizona, extreme southwest New Mexico, and northern Sonora Mexico.
The Tortolita Mountains are a modest mountain range northwest of Tucson, Arizona, USA, at the northern boundaries of Oro Valley and Marana, two suburbs of Tucson. Peak elevation is 4,696 feet. Much of the mountain range is protected within the Tortolita Mountain Park, established in 1986 by Pima County, which plans to expand its territory.
The Catalina Highway, officially the General Hitchcock Highway, is the popular name for a Forest Highway and scenic route located in Pima County in southern Arizona. Also known as the Sky Island Scenic Byway, the Mount Lemmon Highway and Arizona Forest Highway 39, the Catalina Highway is the only paved roadway providing access to the resort village of Summerhaven as well as various recreational and scientific facilities located near the summit of Mount Lemmon. Ascending from the desert floor in Tucson to near the summit of Mount Lemmon, the short highway gains over 6,000 ft (1.8 km), showcasing a variety of climates ranging from lowland desert to alpine forests. The name sky island comes from the analogy of these mountains being like islands of forest in a sea of desert. It is designated as a scenic byway by the National Scenic Byways Program. and an Arizona Scenic Road by the Federal Highway Administration.
Pima Canyon is a major canyon located in the Santa Catalina Mountains, north of Catalina Foothills and Tucson, Arizona, US. Pusch Ridge forms the northwestern cliffs of Pima Canyon, dramatically rising from Pima Creek on the canyon floor. Pima Canyon varies greatly in elevation, from 2,900 feet (880 m) above sea level at Pima Creek to 6,350 feet (1,940 m) at Pima Saddle. Mount Kimball is the highest peak in the vicinity of the canyon.
The Pima County Public Library (PCPL) system serves Pima County, Arizona, with a main library and 26 branch libraries as well as bookmobile service. The system has its headquarters in Tucson. The service area includes the city of Tucson and the surrounding communities of Arivaca, Green Valley, Sahuarita, South Tucson, Ajo, Vail, Marana, Casas Adobes, and Catalina. The town of Oro Valley's library joined the Pima County Public Library system in July 2012.
The Catalina Foothills Unified School District #16 is the PreK-12 school district for the Catalina Foothills area of Tucson, Arizona. Established in 1931, it has eight schools: one high school (9-12), two middle schools (6-8), four elementary schools (K-5) and one early learning center (PreK). The district educates over 5000 students who live throughout the greater Tucson metro area. Mary Kamerzell, Ph.D., has served as superintendent since 1996.
The Loop is a network of shared-use paths in metropolitan Tucson, Arizona maintained by Pima County. Once complete it will comprise 131 miles (211 km) of paved trails dedicated to cyclist, pedestrian, and equestrian use. By 2014, the network was 85% complete, with over one hundred miles in place. Pima County estimates the Loop is used by an average of 2,000 visitors each weekday and more than 5,000 on weekends.
The geology of Arizona began to form in the Precambrian. Igneous and metamorphic crystalline basement rock may have been much older, but was overwritten during the Yavapai and Mazatzal orogenies in the Proterozoic. The Grenville orogeny to the east caused Arizona to fill with sediments, shedding into a shallow sea. Limestone formed in the sea was metamorphosed by mafic intrusions. The Great Unconformity is a famous gap in the stratigraphic record, as Arizona experienced 900 million years of terrestrial conditions, except in isolated basins. The region oscillated between terrestrial and shallow ocean conditions during the Paleozoic as multi-cellular life became common and three major orogenies to the east shed sediments before North America became part of the supercontinent Pangaea. The breakup of Pangaea was accompanied by the subduction of the Farallon Plate, which drove volcanism during the Nevadan orogeny and the Sevier orogeny in the Mesozoic, which covered much of Arizona in volcanic debris and sediments. The Mid-Tertiary ignimbrite flare-up created smaller mountain ranges with extensive ash and lava in the Cenozoic, followed by the sinking of the Farallon slab in the mantle throughout the past 14 million years, which has created the Basin and Range Province. Arizona has extensive mineralization in veins, due to hydrothermal fluids and is notable for copper-gold porphyry, lead, zinc, rare minerals formed from copper enrichment and evaporites among other resources.
