The development of the Aburra Valley occurred in the 1930s after a rapid population growth that produced a conurbation of Medellín, Itagüí, Envigado and Bello.
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The Metropolitan Area of the Aburrá Valley borders with the municipalities of Ebejico, Heliconia, Angelopolis and Amagá to the west, with the municipalities of Santa Barbara and Fredonia to the south.
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With the industrialization the middle and higher class moved to the southern parts of the city like El Poblado, which ultimaltely reached the city of Envigado, while the working class population of Medellín reached cities to the north (Bello) and the southwest (Itagüí).
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The main urban area of the Metropolitan Area of the Aburrá Valley is located in the center of the valley and consists of the four largest cities by population: Medellin, Bello, Itagüí and Envigado.
Consistent and adequate precipitation in the surrounding basins usually ensures that nearby water basins feeding the Aburrá Medellín River basin and subsequently the MAM can store approximately 178 BCM of water for the Metropolitan Area of the Aburrá Valley.