Region VIII (Spanish: Región VIII.
 Naucalpan) is an intrastate region within the State of Mexico.
 It borders Mexico City to the northwest in the Valley of Mexico, and the entire region is part of Metropolitan Area of the Valley of Mexico but the two least populated cities are left out of the Mexico City Metropolitan Area (see Greater Mexico City).
 It comprises five cities: Huixquilucan,
Greater Toluca or the Metropolitan Area of Toluca is the conurbation formed by Toluca, as the core city, and 12 adjacent municipalities of the state of Mexico, namely Almoloya de Juárez, Calimaya, Chapultepec, Lerma, Metepec, Mexicaltzingo, Ocoyoacac, Otzolotepec, San Mateo Atenco, Xonacatlán and Zinacantepec.
 The city of Toluca is just one of several cities/towns (called "localidades" in Mexico) that comprise the municipality of Toluca.
 The municipality of Toluca, in 2005, had a population of around 750 thousand, whereas the population of the entire metropolitan area was 1.6 million, making it the fifth largest metropolitan area of Mexico after Greater Mexico City, Greater Guadalajara, Greater Monterrey and Greater Puebla.
Region IV (Spanish: Región IV.
 Cuautitlán Izcalli) is an intrastate region within the State of Mexico.
 It lies to the north of Mexico City in the Valley of Mexico, borders the state of Hidalgo, and the whole region is one of 10 regions in the state which comprise the Metropolitan Area of the Valley of Mexico, but the least populated least dense and farthest municipality is not included in the definition of Mexico City Metropolitan Area (see Greater Mexico City).
 The region comprises five cities, Coyotepec,
The Guadalajara Metropolitan Area (officially, in Spanish: "Zona Metropolitana de Guadalajara") is the most populous metropolitan area of the Mexican state of Jalisco and the second largest in the country after Greater Mexico City.
 It includes the core municipality of Guadalajara and the surrounding municipalities of Zapopan, Tlaquepaque, Tonalá, Tlajomulco de Zúñiga, El Salto, Ixtlahuacán de los Membrillos and Juanacatlán.
Region V (Spanish: Región V. Ecatepec) is an intrastate region within the State of Mexico.
 It lies to the north of Mexico City in the Valley of Mexico, borders the state of Hidalgo, and the whole region is one of 10 regions in the state which comprise the Metropolitan Area of the Valley of Mexico, but the least populated least dense and farthest municipality is not included in the definition of Mexico City Metropolitan Area (see Greater Mexico City).
 The region comprises five cities, Ecatepec de Morelos,
Cuautitlán (] ) is a city and municipality in the State of Mexico, just north of the northern tip of the Federal District (Distrito Federal) within the Greater Mexico City urban area.
 The city has engulfed most of the municipality, making the two synonymous.
 The name comes from Nahuatl and means 'between the trees.'
Greater Mexico City refers to the conurbation around Mexico City, officially called Valley of Mexico Metropolitan Area ("Zona Metropolitana del Valle de México"), constituted by Mexico City itself composed of 16 Municipalities—and 41 adjacent municipalities of the states of Mexico and Hidalgo.
 For normative purposes, however, Greater Mexico City most commonly refers to the Metropolitan Area of the Valley of Mexico ("Zona Metropolitana del Valle de México") an agglomeration that incorporates 18 additional municipalities.
 As of 2010 Census, Greater Mexico City had a population just over 20 million, making it the largest metropolitan area in North America just ahead of the New York metropolitan area.
 But as of a 2014 census, it's estimated the population of Greater Mexico City was 25.4 million people, making it the largest urban agglomeration in the western hemisphere.
 It is surrounded by thin strips of highlands which separate it from other adjacent metropolitan areas, of which the biggest are Puebla, Toluca, and Cuernavaca-Cuautla, and together with which it makes up the Mexico City megalopolis.
Greater Mexico City ("Zona Metropolitana del Valle de México"), a metropolitan area with more than 19 million inhabitants including Mexico's capital ("Distrito Federal", or DF) with about 9 million inhabitants, faces tremendous water challenges.
 These include groundwater overexploitation, land subsidence, the risk of major flooding, the impacts of increasing urbanization, poor water quality, inefficient water use, a low share of wastewater treatment, health concerns about the reuse of wastewater in agriculture, and limited cost recovery.
 Overcoming these challenges is complicated by fragmented responsibilities for water management in Greater Mexico City:
Ciudad Jardín Bicentenario, also known as Ciudad Jardín, is a sports and shopping complex in Ciudad Nezahualcóyotl ("Neza"), State of Mexico, part of Greater Mexico City.
 Opened in May 2009, it was developed on 250 hectares of what were the Neza I y II landfills, which in their 65 years of history received over 12,000 tons of garbage from Mexico City.
 On 60 ha a sports center was built, the largest in Greater Mexico City.
 On the second lot a shopping center was built, inaugurated in late 2008, as well as a higher education institute, a hospital, medical offices, a community center and an entertainment area.
The Circuito Exterior Mexiquense literally, "Outer Loop of the State of Mexico", also known as the Vía Mexiquense or "'Autopista mexiquense'" is a series of toll roads constructed between 2006 and 2011 by the State of Mexico government, providing an option for motorists to skirt the edge of Greater Mexico City when driving between areas in the State of Mexico to the northwest of Mexico City, northeast of Mexico City (e.g. Ecatepec) and east of Mexico City (e.g. Ciudad Nezahualcóyotl and Chalco).
 Portions carry the Mexican Federal Highway 57D designation, and others carry the State of Mexico State Highway 5D designation (sometimes with a federal shield).

Question: Cuautitlán and Greater Mexico City are both towns in what Metropolitan Area?
Answer: Metropolitan Area of the Valley of Mexico