Manaus stands where the Rio Negro meets the Solimões River in the Amazon.
The meeting of the waters is famous because the two rivers flow side by side for several kilometres before their waters mix fully. The dark, acidic Rio Negro contrasts visibly with the pale, sediment-rich Solimões, which is the name used for the upper Amazon River in Brazil.
Manaus is the capital of Amazonas state and one of the largest cities in the Amazon region. Its position made it an important river port, and its fortunes rose dramatically during the late nineteenth- and early twentieth-century rubber boom. The city’s Teatro Amazonas is a celebrated reminder of that period.
The rivers do not remain permanently separate. Differences in temperature, speed, density, and sediment help maintain the visible boundary near the confluence, but turbulence gradually blends the waters downstream. The site is therefore a natural meeting zone, not a permanent dividing line.