Type locality of Corydoras benattii, Mato Grosso, between Canarana and Gaúcha do Norte, Rio Culuene, a tributary to the Rio Xingu. It is known from Rio Xingu and Rio Tapajós basins, Brazilian Amazon. In the Rio Xingu basin, it is also known in Pará State from the Rio Fresco sub drainage (Rio Trairão and Igarapé Manguari), middle Rio Xingu and from the lower Rio Xingu basin near Altamira. In the Rio Tapajós basin, it occurs in the Rio Peixoto de Azevedo, a tributary to the Rio Teles Pires, Mato Grosso and from Rio Cururu, a tributary to the Rio São Manuel, Pará (Ref. 122129).