El Alto
El Alto (Spanish for The Heights) is the second-largest city in Bolivia, located adjacent to La Paz in Pedro Domingo Murillo Province on the Altiplano highlands. El Alto is today one of Bolivia's fastest-growing urban centers, with a population of 974,754 in 2011. El Alto is the highest major metropolis in the world, with an average elevation of 4,150 m (13,615 ft).
The El Alto-La Paz metropolitan area, formed by the cities of El Alto, La Paz, and Viacha, constitutes the most populous urban area of Bolivia, with a population of 2.3 million inhabitants (greater than the metropolitan area of the country's largest city of Santa Cruz de la Sierra).
History
The dry and inclement plain above La Paz was uninhabited until 1903, when the newly built railways from Lake Titicaca and Arica reached the rim of the canyon, where the La Paz terminus, railyards and depots were built along with a settlement of railway workers (a spur line down into the canyon opened in 1905). In 1925 the airfield was built as base for the new air force, which attracted additional settlement. In 1939 El Alto's first elementary school opened. El Alto started to grow tremendously in the 1950s, when the settlement was connected to La Paz' water supply (before that all water had to be transported from La Paz in tanker vehicles) and building land in the canyon became more and more short and expensive. In an administrative reform on March 6, 1985 the district of El Alto and surroundings was politically separated from the City of La Paz (this date is officially referred to and celebrated as the city's "founding day"). In 1987 El Alto was formally incorporated as a city. In 1994, the city became the seat of the Roman Catholic Diocese of El Alto.