The Brazilian Opportunity Atlas combines multiple large-scale government datasets to map intergenerational income mobility in Brazil with unprecedented detail. It is among the first studies to use administrative data from a developing country to measure social mobility and the database is the result of research by Diogo Britto, Alexandre Fonseca, Paolo Pinotti, Breno Sampaio, and Lucas Warwar, reported in Britto et al. (2025) and supported by the CLEAN Unit on the Economic Analysis of Crime (Bocconi) and GAPPE - Grupo de Avaliação de Políticas Públicas (UFPE). A key feature of the Atlas is that it considers informal income, which constitutes a large share of the economy in developing countries but is typically missing from administrative data. The Atlas reveals that a 10-percentile increase in parental income rank is associated with a 5.5-percentile increase in the child’s income rank in adulthood. Only 2.5% of children born in the bottom 20 percentiles reach the top 20 percentiles as adults. Overall, Brazil’s income mobility is well below comparable estimates for developed countries using similar methods. Yet, the Atlas shows that some Brazilian areas – mainly outside the largest cities – offer significantly better opportunities for children born in poor families. More detailed mobility and socioeconomic data for Brazil can be found in the Brazilian Atlas of Social Mobility. The latter was developed by a partnership between the authors of the study, IMDS - Institute for Mobility and Social Development, and GAPPE - Grupo de Avaliação de Políticas Públicas.