Definition from Wiktionary, the free dictionary
confluence (plural confluences)
- The place where two rivers, streams, or other continuously flowing bodies of water meet and become one, especially where a tributary joins a river.
- We encountered an abandoned boat at the confluence of the Mississippi and Ohio Rivers.
- The act of combining which occurs at the place where rivers and the like meet.
- The confluence of the rivers produced a great rush of water.
- A convergence or combination of forces, people, or things.
- The confluence of our skills resulted in a successful home renovation project.
Derived terms 
point where two rivers or streams meet