Iztapalapa () is a borough ("demarcación territorial") in Mexico City, located on the eastern side of the city. The borough is named after and centered on the formerly independent municipality of Iztapalapa (officially Iztapalapa de Cuitláhuac). The rest is made up of a number of other communities which are governed by the city of Iztapalapa.
With a population of 1,835,486 as of 2020, Iztapalapa is the most populous borough of Mexico City and as well as the most populous municipality in the country. Over 90% of its territory is urbanized. The formerly rural borough, which was home to some farms and canals as late as the 1970s, to an area with its only greenery in parks; nearly all of its population employed in commerce, services and industry. This is the result of a large influx of people into the borough starting beginning in the 1970s, with the borough still attracting migrants. 
Iztapalapa remains afflicted by high levels of economic deprivation, and a significant number of its residents lack access to clean drinking water. Iztapalapa has one of the highest rates of violent crime in Mexico City. Combatting homicides and drug trafficking remain a major issue for local authorities. 
The borough is home of one of Mexico City's major cultural events, the annual Passion Play in which 450 borough residents participate and about 2 million attend as spectators.
Background.
Iztapalapa today is a borough of the Mexico City, centered on what used to be an independent settlement with its origins in the pre-Hispanic period. It has a territory of , and is located on the east side of the Mexico City bordering the boroughs of Iztacalco, Xochimilco, Tláhuac, Coyoacán and Benito Juárez. The State of Mexico borders the borough on the east side, and Iztapalapa has strong cultural and economic ties to this part of the state.
The borough was created in 1928, centered on and named after a formerly independent municipality within the then Federal District, which already had governing authority over a number of surrounding communities. The modern borough is made up of 15 “barrios” or neighborhoods, considered to be part of city of Iztapalapa, and 18 other “pueblos” or communities outside of it. To distinguish the original city of Iztapalapa from the rest of the borough, it was officially named Iztapalapa de Cuitláhuac in 2006 in honor of the tenth Aztec emperor. However, eight of the barrios are considered to be the historic center of the city of Iztapalapa, which are La Asunción, San Ignacio, Santa Barbara, San Lucas, San Pablo, San Miguel, San Pedro and San José. 
Records of the “eight barrios of Iztapalapa” go back at least until 1898. Borough authorities have sought “Barrios Mágicos Turísticos” (Magical Tourism Neighborhoods) status for these, for a program similar to the “Pueblos Mágicos” tourism program run by the federal government. The goal is to attract visitors to these neighborhoods as well as other landmarks of the borough such as the Cerro de la Estrella, Pueblo Culhuacán, the Churubusco Gardens, La Magdalena Atlazolpa, Los Reyes, San Antonio Culhuacán, Mexicalzingo, the San Lorenzo Cemetery, San Andrés Tetepilco and San José Aculco.
Elevation and climate.
The borough has an average elevation of asl and extends over firm land and what was former lake bed of Lake Texcoco. Some of the firm land is alluvial plain but most of it are elevations such as the Cerro de la Estrella ( asl), Peñón Viejo or Peñon del Marqués ( asl), and the Sierra de Santa Catalina, which contains the Cerro Tecuatzi ( asl), Cerro Tetecón ( asl), and the Guadalupe Borrego ( asl), Xaltepec ( asl); and Yuhualixqui ( asl) volcanoes. These are recent geological formations, with evidence of lava flow still existent and none extend over above the valley floor. Culturally, the most important of these elevations is the Cerro de la Estrella, which was the site of the New Fire ceremony. Since the pre-Hispanic period, Lake Texcoco has been drained, leaving behind only two natural river called the Churubusco and La Piedad, which unite to form the Unido River, and a few canals. However, the rivers are confined to large pipes as is one of the canals, and most of the Canal Nacional which forms part of the border of the borough has been filled in to create Calzada La Viga road. For this reason, there are no longer any naturally occurring surface water. 
The climate of the area is divided into four zones. One consists of a warm wet climate with temperatures above in the coldest months. Another is a temperate wet climate with temperatures between in the coldest months. One has a relatively dry climate with a range of temperatures, and the last consists of a cold climate with average temperature not exceeding . Most of the area falls into the temperate category and all receive most of their rainfall in the summer and early fall.
Urbanization.
Uncontrolled population growth in the area has nearly wiped out all forms of wildlife in the borough, although as late as the 1960s, there were still a number of waterfowl to be found. Animals found here now are pets or the few cases in which families still raise domestic fowl, rabbits and others for food. Almost all of the borough (90%) is urbanized, with only six percent designated as ecological reserve, concentrated in two parks, the Cerro de la Estrella National Park and the Sierra de Santa Catarina, declared a reserve in 1994. However, both of these areas are under pressure by the continued urbanization and population growth of the area.
Iztapalapa and most of the east side of the Federal District was historically rural and poor up until the mid-20th century. Large-scale urbanization and industrialization began in the 1950s, along with high rates of migration into the borough in the 1970s. Today, it has high population density, limited infrastructure and high levels of socio economic marginalization. Social problems include homelessness, unregulated street vending, illegal building and crimes associated with the sex trade. Many live in rundown housing with deficient municipal services. The exception to this are the areas that border the boroughs of Benito Juárez, Coyoacán and Iztacalco. As of 2010, about 30% of the borough's buildings still have damage from the 1985 earthquake. Most are located in the Peñon Viejo, Ermita Zaragoza, Santa Martha Acatitla, Santa Cruz Meyehualco, El Molino, San Lorenzo and La Hera areas, with about 150,000 damaged homes. Over 95% of the homes in the borough have electricity, running water and sewerage, and the borough provides sufficient educational services and other services such as sports facilities; however, the high population density means that the five or less percent equals a large number of people without sufficient services.
Crime.
Primary problems facing the borough include crime, especially drug trafficking and sale of stolen auto parts, and also lack of water supply. Iztapalpa has the highest rates of rape, violence against women, and domestic violence in Mexico City. Most crime is connected with small scale drug trafficking, which is becoming more frequent on the borough's streets. Between 2008 and 2010, there were 470 murders in the borough, two out of ten for all of Mexico City, with one occurring every two days. It also has one of the highest rates of muggings and robberies of taxi drivers and public buses. Most of the crime problems are concentrated into a group of neighborhoods, such as Santa Martha Acatitla Norte, Desarrollo Urbano Quetzalcoatl, Tenorios, La Polvorilla, Santa Cruz Meyehualco, San Miguel Teotongo, Xalpa, Lomas Estrella, Lonas de Zaragoza and Achualtepec. This area has over 100 known points where drugs are sold. Its proximity to municipalities such as Nezahualcoyotl in the State of Mexico allows criminals to escape jurisdiction easily. However, the borough reports that crime rates diminished 5.41% from 2009 to 2010. Basic services, especially potable water, is lacking in many of these same areas, which are close to the Sierra de Santa Catalina where there is no piped water service; rather it is delivered in trucks to home storage tanks. Sometimes the wait for these trucks can last hours, and there have been hijackings of water delivery trucks. About 96% of homes in the borough do have piped-in water, but about 500,000 residents have insufficient supplies, low pressure and in many places the water quality is visibly poor. Visibly dirty water is locally called “agua de tamarindo” (tamarind water) because of its brown color.
Landmarks.
The borough is home to a number of historic churches, many of which were built in the colonial era. The Franciscans built monasteries and churches in communities such as Huitzilopohco, San Marcos Mexicaltzingo, Santa Marta, and Nativitas Tepetlacingo. Most of these churches, especially those of San Lucas Evangelista, San Marcos Mexicaltzingo, San Juan Evangelista and the chapels of Calvario and Santa Martha Acatitla were built over foundations of pre Hispanic temples, which had been destroyed in the Conquest. The main parish church building of the city of Iztapalapa dates from at least 1664. Its main entrance contains various indigenous symbols. Some churches, however, were built later, such as the Asunción de María parish church built in 1890, and the current San Juan Evangelista church built between 1880 and 1897.
The two most important religious establishments have been Señor de la Cuevita Sanctuary and the former monastery of Culhuacán. The Señor de la Cuevita Sanctuary is located on Avenida Morelos and 16 de Septiembre in the city of Iztapalapa. It was built to house an image of Christ made of cornstalks which is called the “Señor de la Cuevita” (Lord of the Small Cave). According to legend, this image was taken from here to Etla, Oaxaca, but it mysteriously disappeared from there to reappear in a small cave back in Iztapalapa. However, its importance stems from a miracle attributed to it. In 1833, the area was hit by the 1826–1837 cholera pandemic. People appealed to this image and when the plague dissipated, this image was given credit. Yearly rites of gratitude to this image eventually developed into the borough's annual Passion Play. Since 1853, this church has been the center of most indigenous dance held. This is because in that year the archbishop of Mexico forbade “pagan” dances and to avoid confrontation, the dances began to be held here in the main atrium. In 1875, the church was painted by Anacleto Escutia.
The most important monastery founded in the area in the colonial period was in Culhuacán by the Augustinians. This monastery was begun in 1552 and dedicated to John the Baptist. The Augustinians founded a school to teach indigenous languages which operated for over 100 years. It was also a center of paper making, taking advantage of springs and canals for water. The original church of the monastery was demolished a long time ago, but parts of the original complex still remain. The original church was replaced in the late 19th century by the San Juan Evangelista parish church, built between 1880 and 1897. The rest of the complex has been secularized since the 19th century and declared a national monument in 1944. From 1960 to 1984, it was occupied by INAH, which renovated it. Today, this complex is home to the Museo del Exconvento de Culhuacán (Museum of the Former Monastery of Culhuacán), inaugurated in 1987. The grounds around it are referred to as the Parque Historico y Centro comunitario Culhuacán (Culhuacán Historic Park and Community Center). The park contains an artificial pond and areas planted with native trees such as ahuejotes. The monastery complex itself still contains a number of frescos on its walls, and its library is still an important cultural and research center. A number of the old monks’ cells now contain exhibits related to the institution.
The Cerro de la Estrella National Park was established in 1938 and is considered to be the most important natural area in the eastern part of the Valley of Mexico. The park covers over and was established for recreational and cultural purposes. The hill (cerro) was the site of the Aztec New Fire ceremony, last performed in 1507. The park is also culturally important due to the annual Passion Play which is partially conducted on the summit of the cerro each year. The area is managed by the Secretaría de Agricultura y Recursos Hidráulicos, but it lost its original forest cover due to over-cutting of trees. The ecosystem now