A khoroolol (; ) is a residential complex of Mongolia, equivalent to a neighbourhood. In densely built residential areas, it is similar to a quarter ( mikrorayon). In Ulaanbaatar, the apartment khoroolols built during socialist times carry numbers between one and nineteen, though some are named after higher numbers like 40,000 and 120,000.Chinbat Badamdorj, Changes in the Internal Structure of Ulaanbaatar, Mongolia , p.4f
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