Asakiyume mita

The meeting of the waters is where the Rio Negro joins the Amazon--or, as Brazilians name the upper portion of it, the Rio Solimões--at Manaus, Brazil. This happens over a thousand miles east of where I was in Leticia, Colombia. In other words, the broad, broad waters I experienced were the Rio Solimões/upper Amazon before the Rio Negro adds its waters in.

This vasty vastness is what you get where they join. For perspective, look at the size of that boat in the first few seconds (the whole video is less than a minute long). Because of the difference in what the waters are carrying, they flow side by side without mingling for a good while.