Yes, but I thought you were looking for the place where the longest river not going to an ocean, sea, gulf, or lake
ended.
Francis wrote:In this place ends the world's biggest river not going to a sea or an ocean...
My answer,
Río de la Plata, is where the long river in question,
Paraná, ends after travelling 2,795 miles (4,498 km).
I take it you are of the impression there is a longer such river?