Viacha Municipality in the context of La Paz Department (Bolivia)

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 an estimated population of 943,558 in 2020. It is also the highest major city in the world, with an average elevation of 4,000 m (13,123 ft).

The El Alto–La Paz metropolitan area, formed by La Paz, El Alto, Achocalla, Viacha, and Mecapaca, constitutes the most populous urban area of Bolivia, with a population of about 2.2 million. The city is rapidly developing, although significant challenges with substandard infrastructure and utilities remain, especially in the outlying areas.