Confluence
Confluence means the meeting of two or more waterways.
It usually means the point where a smaller river joins a more major river.
Example
The German city name Koblenz indicates that the city lies at the point at the confluence of the Rhine and the Moselle.
Confluence Media
Confluence of the Bhagirathi and Alaknanda Rivers at the Ganges in Devprayag, India
Confluence of the Mississippi, Missouri, and Illinois rivers with normal water levels in 1991, and during a flood in 1993
The fountain at Point State Park in Pittsburgh, at the apex of the confluence of the Allegheny (top) and the Monongahela
The White Nile and Blue Nile merge at Khartoum; April 2013 satellite view.
The Nam Khan flows into the Mekong at Luang Prabang in Laos.