Iztapalapa is a borough (demarcación territorial) in Mexico City, located on the east side of the entity. The borough is named after and centered on the formerly independent municipality of Iztapalapa, which is officially called Iztapalapa de Cuitláhuac for disambiguation purposes. The rest is made up of a number of other communities which are governed by the city of Iztapalapa. With a population of 1.8 million as of 2010, Iztapalapa is the most populous borough of Mexico City, and it is also the most populous municipality in the country. Over 90% of its territory is urbanized. The borough transitioned from a rural area with some farms and canals as late as the 1970s, to an area with the only green areas in parks and almost all of its people employed in commerce, services and industry. This is the result of a large influx of people into the borough starting from the 1970s and which still continues. 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, and 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.