executive of each province is a lieutenant governor (teniente governador), an official appointed by the governor. These 12 provinces comprise a total of 80 districts (distritos). The provinces, with their capitals are: Economy Principal companies Some of the main companies in La Libertad Region are the following: Cementos Pacasmayo, It manufactures cement and it is based in Pacasmayo Province. Sociedad Agrícola Virú, dedicated to agribusiness and based in Virú Province. SEDALIB, water supply and sanitation company based in Trujillo city. Caja Trujillo, banking company centered in Trujillo. Cesar Vallejo University, based in Víctor Larco city Archaeology The coastal strip set the stage for the rise of many pre-Columbian cultures, such as the pre-Ceramic Huaca Prieta civilization, which is more than 5,000 years old & the Cupisnique, which is more than 3,000 years old. From 200 A.C., the first one to expand beyond its cradle was the Moche or Mochica culture. It was basically an agriculture and/or a warrior culture, which built countless temples and palaces such as the Sol (Sun), Luna (Moon), El Brujo & Cao Viejo, and other huacas. The Chimú culture emerged later and built its capital in Chan Chan, the largest pre-Columbian city in South America, & huacas like Esmeralda & Arco Iris (Rainbow). At its zenith, Chan Chan was home to 60,000 inhabitants who stubbornly resisted the expansion of the Inca Empire. These ancient cultures used irrigation canals and water reservoirs, which systems were increasingly better engineered and extensive over the years. The technological acumen of these sophisticated agricultural systems was carried into the Inca Empire, which surrounded the remnants of the prior cultures. The Spanish colonizers destroyed most of the agricultural works to more effectively establish political control and provide de facto slave labor from the displaced native agriculturalists. The archaeological remains of Chan Chan, 6 km (3.7 mi) northeast of downtown Trujillo, are rather well-preserved despite being built out of adobe (mud bricks), largely because 1) dearth of rainfall and consequent erosion, and 2) lack of significant re-use of its construction materials (adobes do not respond easily to removal and transport and are relatively cheap to make on-site in current methods of construction). During the Late Moche phase (AD 600 to 850), one of the largest power centers of the region was the fortified site of Cerro Chepén in the Jequetepeque Valley. It is located to the south of the site of San José