The confluence of the two rivers mainly exhibits these conditions due to factors like the flow velocity of the water, the content of impurities in the water, and variations in water temperature.
The flow of the Black River is relatively slow on this tributary, incorporating a large amount of humus from the riverbanks into its current, which is why its color appears somewhat darker. In contrast, the Amazon River's channel is wider and deeper, which means less sediment in the water.
Furthermore, the temperature differences between water at various depths cause a form of stratification after mixing. About ten kilometers further up, the waters will completely blend, a normal physical phenomenon, so there's no need for overinterpretation or excessive alarm.
Additionally, we chose to anchor at the mouth of the river because there's more food here, and schools of fish gather, making it easier to catch larger specimens.
