In due course, the Casiquiare will likely capture the upper Orinoco, diverting all its flow into the Amazon via the Rio Negro - though the lower Orinoco will re

In due course, the Casiquiare will likely capture the upper Orinoco, diverting all its flow into the Amazon via the Rio Negro - though the lower Orinoco will remain a major river in its own right. https://en.wikipedia.org/wiki/Casiquiare_canal https://en.wikipedia.org/wiki/Casiquiare_canal