Lagoa do Arroz is a lake located in the municipality of Barcelos, in the state of Amazonas, Brazil. Situated at approximately -1.595309 latitude and -61.498974 longitude, this water body lies within the broader Rio Negro basin, one of the most iconic blackwater river systems in the Amazon region. The lake sits in close proximity to several other notable lagoas and waterways, including Lagoa Samaúma, Lagoa do Arapari, and the Rio Negro itself, which flows roughly 3 to 4 miles away. This network of interconnected lakes and channels is characteristic of the flooded várzea and igapó landscapes of the central Amazon, where seasonal water level fluctuations shape the entire aquatic ecosystem and fishing experience.